(\"M04\").GetMethod;\n\n Assert.False(m04.IsAbstract);\n Assert.False(m04.IsVirtual);\n Assert.False(m04.IsMetadataVirtual());\n Assert.False(m04.IsSealed);\n Assert.True(m04.IsStatic);\n Assert.False(m04.IsExtern);\n Assert.False(m04.IsAsync);\n Assert.False(m04.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m04));\n\n var m05 = i1.GetMember<PropertySymbol>(\"M05\").GetMethod;\n\n Assert.True(m05.IsAbstract);\n Assert.False(m05.IsVirtual);\n Assert.True(m05.IsMetadataVirtual());\n Assert.False(m05.IsSealed);\n Assert.True(m05.IsStatic);\n Assert.False(m05.IsExtern);\n Assert.False(m05.IsAsync);\n Assert.False(m05.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m05));\n\n var m06 = i1.GetMember<PropertySymbol>(\"M06\").GetMethod;\n\n Assert.True(m06.IsAbstract);\n Assert.False(m06.IsVirtual);\n Assert.True(m06.IsMetadataVirtual());\n Assert.False(m06.IsSealed);\n Assert.True(m06.IsStatic);\n Assert.False(m06.IsExtern);\n Assert.False(m06.IsAsync);\n Assert.False(m06.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m06));\n\n var m07 = i1.GetMember<PropertySymbol>(\"M07\").GetMethod;\n\n Assert.True(m07.IsAbstract);\n Assert.False(m07.IsVirtual);\n Assert.True(m07.IsMetadataVirtual());\n Assert.False(m07.IsSealed);\n Assert.True(m07.IsStatic);\n Assert.False(m07.IsExtern);\n Assert.False(m07.IsAsync);\n Assert.False(m07.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m07));\n\n var m08 = i1.GetMember<PropertySymbol>(\"M08\").GetMethod;\n\n Assert.False(m08.IsAbstract);\n Assert.False(m08.IsVirtual);\n Assert.False(m08.IsMetadataVirtual());\n Assert.False(m08.IsSealed);\n Assert.True(m08.IsStatic);\n Assert.False(m08.IsExtern);\n Assert.False(m08.IsAsync);\n Assert.False(m08.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m08));\n\n var m09 = i1.GetMember<PropertySymbol>(\"M09\").GetMethod;\n\n Assert.False(m09.IsAbstract);\n Assert.False(m09.IsVirtual);\n Assert.False(m09.IsMetadataVirtual());\n Assert.False(m09.IsSealed);\n Assert.True(m09.IsStatic);\n Assert.False(m09.IsExtern);\n Assert.False(m09.IsAsync);\n Assert.False(m09.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m09));\n\n var m10 = i1.GetMember<PropertySymbol>(\"M10\").GetMethod;\n\n Assert.False(m10.IsAbstract);\n Assert.False(m10.IsVirtual);\n Assert.False(m10.IsMetadataVirtual());\n Assert.False(m10.IsSealed);\n Assert.True(m10.IsStatic);\n Assert.False(m10.IsExtern);\n Assert.False(m10.IsAsync);\n Assert.False(m10.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m10));\n }\n }\n\n [Fact]\n public void PropertyModifiers_02()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool M01 { get\n => throw null; } \n\n virtual static bool M02 { get\n => throw null; } \n\n sealed static bool M03 { get\n => throw null; } \n\n override static bool M04 { get\n => throw null; } \n\n abstract virtual static bool M05 { get\n { throw null; } } \n\n abstract sealed static bool M06 { get\n => throw null; } \n\n abstract override static bool M07 { get\n => throw null; } \n\n virtual sealed static bool M08 { get\n => throw null; } \n\n virtual override static bool M09 { get\n => throw null; } \n\n sealed override static bool M10 { get\n => throw null; } \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 26),\n // (4,32): error CS0500: 'I1.M01.get' cannot declare a body because it is marked abstract\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M01.get\").WithLocation(4, 32),\n // (7,25): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 25),\n // (10,24): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed static bool M03 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(10, 24),\n // (13,26): error CS0106: The modifier 'override' is not valid for this item\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 26),\n // (16,34): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 34),\n // (16,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(16, 34),\n // (16,40): error CS0500: 'I1.M05.get' cannot declare a body because it is marked abstract\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M05.get\").WithLocation(16, 40),\n // (19,33): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 33),\n // (19,33): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 33),\n // (19,39): error CS0500: 'I1.M06.get' cannot declare a body because it is marked abstract\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M06.get\").WithLocation(19, 39),\n // (22,35): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 35),\n // (22,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 35),\n // (22,41): error CS0500: 'I1.M07.get' cannot declare a body because it is marked abstract\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M07.get\").WithLocation(22, 41),\n // (25,32): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 32),\n // (25,32): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(25, 32),\n // (28,34): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 34),\n // (28,34): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 34),\n // (31,33): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 33),\n // (31,33): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(31, 33)\n );\n\n ValidatePropertyModifiers_01(compilation1);\n }\n\n [Fact]\n public void PropertyModifiers_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool M01 { get\n ; } \n\n virtual static bool M02 { get\n ; } \n\n sealed static bool M03 { get\n ; } \n\n override static bool M04 { get\n ; } \n\n abstract virtual static bool M05 { get\n ; } \n\n abstract sealed static bool M06 { get\n ; } \n\n abstract override static bool M07 { get\n ; } \n\n virtual sealed static bool M08 { get\n ; } \n\n virtual override static bool M09 { get\n ; } \n\n sealed override static bool M10 { get\n ; } \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (7,25): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 25),\n // (13,26): error CS0106: The modifier 'override' is not valid for this item\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 26),\n // (16,34): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 34),\n // (19,33): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 33),\n // (22,35): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 35),\n // (25,32): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 32),\n // (28,34): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 34),\n // (28,34): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 34),\n // (31,33): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 33)\n );\n\n ValidatePropertyModifiers_01(compilation1);\n }\n\n [Fact]\n public void PropertyModifiers_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool M01 { get\n => throw null; } \n\n virtual static bool M02 { get\n => throw null; } \n\n sealed static bool M03 { get\n => throw null; } \n\n override static bool M04 { get\n => throw null; } \n\n abstract virtual static bool M05 { get\n { throw null; } } \n\n abstract sealed static bool M06 { get\n => throw null; } \n\n abstract override static bool M07 { get\n => throw null; } \n\n virtual sealed static bool M08 { get\n => throw null; } \n\n virtual override static bool M09 { get\n => throw null; } \n\n sealed override static bool M10 { get\n => throw null; } \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS0500: 'I1.M01.get' cannot declare a body because it is marked abstract\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M01.get\").WithLocation(4, 32),\n // (7,25): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 25),\n // (13,26): error CS0106: The modifier 'override' is not valid for this item\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 26),\n // (16,34): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 34),\n // (16,40): error CS0500: 'I1.M05.get' cannot declare a body because it is marked abstract\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M05.get\").WithLocation(16, 40),\n // (19,33): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 33),\n // (19,39): error CS0500: 'I1.M06.get' cannot declare a body because it is marked abstract\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M06.get\").WithLocation(19, 39),\n // (22,35): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 35),\n // (22,41): error CS0500: 'I1.M07.get' cannot declare a body because it is marked abstract\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M07.get\").WithLocation(22, 41),\n // (25,32): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 32),\n // (28,34): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 34),\n // (28,34): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 34),\n // (31,33): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 33)\n );\n\n ValidatePropertyModifiers_01(compilation1);\n }\n\n [Fact]\n public void PropertyModifiers_05()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool M01 { get\n ; } \n\n virtual static bool M02 { get\n ; } \n\n sealed static bool M03 { get\n ; } \n\n override static bool M04 { get\n ; } \n\n abstract virtual static bool M05 { get\n ; } \n\n abstract sealed static bool M06 { get\n ; } \n\n abstract override static bool M07 { get\n ; } \n\n virtual sealed static bool M08 { get\n ; } \n\n virtual override static bool M09 { get\n ; } \n\n sealed override static bool M10 { get\n ; } \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 26),\n // (7,25): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 25),\n // (7,25): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M02\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(7, 25),\n // (10,24): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static bool M03 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 24),\n // (13,26): error CS0106: The modifier 'override' is not valid for this item\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 26),\n // (13,26): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M04\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(13, 26),\n // (16,34): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 34),\n // (16,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 34),\n // (19,33): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 33),\n // (19,33): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 33),\n // (22,35): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 35),\n // (22,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 35),\n // (25,32): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 32),\n // (25,32): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 32),\n // (28,34): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 34),\n // (28,34): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 34),\n // (28,34): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M09\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(28, 34),\n // (31,33): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 33),\n // (31,33): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 33)\n );\n\n ValidatePropertyModifiers_01(compilation1);\n }\n\n [Fact]\n public void PropertyModifiers_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool M01 { get\n => throw null; } \n\n virtual static bool M02 { get\n => throw null; } \n\n sealed static bool M03 { get\n => throw null; } \n\n override static bool M04 { get\n => throw null; } \n\n abstract virtual static bool M05 { get\n { throw null; } } \n\n abstract sealed static bool M06 { get\n => throw null; } \n\n abstract override static bool M07 { get\n => throw null; } \n\n virtual sealed static bool M08 { get\n => throw null; } \n\n virtual override static bool M09 { get\n => throw null; } \n\n sealed override static bool M10 { get\n => throw null; } \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 26),\n // (4,32): error CS0500: 'I1.M01.get' cannot declare a body because it is marked abstract\n // abstract static bool M01 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M01.get\").WithLocation(4, 32),\n // (7,25): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 25),\n // (7,25): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual static bool M02 { get\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M02\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(7, 25),\n // (10,24): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static bool M03 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 24),\n // (13,26): error CS0106: The modifier 'override' is not valid for this item\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 26),\n // (13,26): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // override static bool M04 { get\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M04\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(13, 26),\n // (16,34): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 34),\n // (16,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 34),\n // (16,40): error CS0500: 'I1.M05.get' cannot declare a body because it is marked abstract\n // abstract virtual static bool M05 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M05.get\").WithLocation(16, 40),\n // (19,33): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 33),\n // (19,33): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 33),\n // (19,39): error CS0500: 'I1.M06.get' cannot declare a body because it is marked abstract\n // abstract sealed static bool M06 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M06.get\").WithLocation(19, 39),\n // (22,35): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 35),\n // (22,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 35),\n // (22,41): error CS0500: 'I1.M07.get' cannot declare a body because it is marked abstract\n // abstract override static bool M07 { get\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"get\").WithArguments(\"I1.M07.get\").WithLocation(22, 41),\n // (25,32): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 32),\n // (25,32): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static bool M08 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 32),\n // (28,34): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 34),\n // (28,34): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 34),\n // (28,34): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual override static bool M09 { get\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M09\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(28, 34),\n // (31,33): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 33),\n // (31,33): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static bool M10 { get\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 33)\n );\n\n ValidatePropertyModifiers_01(compilation1);\n }\n\n [Fact]\n public void EventModifiers_01()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01\n ;\n\n virtual static event D M02\n ;\n\n sealed static event D M03\n ;\n\n override static event D M04\n ;\n\n abstract virtual static event D M05\n ;\n\n abstract sealed static event D M06\n ;\n\n abstract override static event D M07\n ;\n\n virtual sealed static event D M08\n ;\n\n virtual override static event D M09\n ;\n\n sealed override static event D M10\n ;\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,29): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event D M01\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 29),\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (10,27): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed static event D M03\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(10, 27),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (16,37): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract virtual static event D M05\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(16, 37),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (19,36): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static event D M06\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 36),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (22,38): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract override static event D M07\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 38),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (25,35): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // virtual sealed static event D M08\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36),\n // (31,36): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed override static event D M10\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n private static void ValidateEventModifiers_01(CSharpCompilation compilation1)\n {\n var i1 = compilation1.GetTypeByMetadataName(\"I1\");\n\n {\n var m01 = i1.GetMember<EventSymbol>(\"M01\");\n\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n var m02 = i1.GetMember<EventSymbol>(\"M02\");\n\n Assert.False(m02.IsAbstract);\n Assert.False(m02.IsVirtual);\n Assert.False(m02.IsSealed);\n Assert.True(m02.IsStatic);\n Assert.False(m02.IsExtern);\n Assert.False(m02.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m02));\n\n var m03 = i1.GetMember<EventSymbol>(\"M03\");\n\n Assert.False(m03.IsAbstract);\n Assert.False(m03.IsVirtual);\n Assert.False(m03.IsSealed);\n Assert.True(m03.IsStatic);\n Assert.False(m03.IsExtern);\n Assert.False(m03.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m03));\n\n var m04 = i1.GetMember<EventSymbol>(\"M04\");\n\n Assert.False(m04.IsAbstract);\n Assert.False(m04.IsVirtual);\n Assert.False(m04.IsSealed);\n Assert.True(m04.IsStatic);\n Assert.False(m04.IsExtern);\n Assert.False(m04.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m04));\n\n var m05 = i1.GetMember<EventSymbol>(\"M05\");\n\n Assert.True(m05.IsAbstract);\n Assert.False(m05.IsVirtual);\n Assert.False(m05.IsSealed);\n Assert.True(m05.IsStatic);\n Assert.False(m05.IsExtern);\n Assert.False(m05.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m05));\n\n var m06 = i1.GetMember<EventSymbol>(\"M06\");\n\n Assert.True(m06.IsAbstract);\n Assert.False(m06.IsVirtual);\n Assert.False(m06.IsSealed);\n Assert.True(m06.IsStatic);\n Assert.False(m06.IsExtern);\n Assert.False(m06.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m06));\n\n var m07 = i1.GetMember<EventSymbol>(\"M07\");\n\n Assert.True(m07.IsAbstract);\n Assert.False(m07.IsVirtual);\n Assert.False(m07.IsSealed);\n Assert.True(m07.IsStatic);\n Assert.False(m07.IsExtern);\n Assert.False(m07.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m07));\n\n var m08 = i1.GetMember<EventSymbol>(\"M08\");\n\n Assert.False(m08.IsAbstract);\n Assert.False(m08.IsVirtual);\n Assert.False(m08.IsSealed);\n Assert.True(m08.IsStatic);\n Assert.False(m08.IsExtern);\n Assert.False(m08.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m08));\n\n var m09 = i1.GetMember<EventSymbol>(\"M09\");\n\n Assert.False(m09.IsAbstract);\n Assert.False(m09.IsVirtual);\n Assert.False(m09.IsSealed);\n Assert.True(m09.IsStatic);\n Assert.False(m09.IsExtern);\n Assert.False(m09.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m09));\n\n var m10 = i1.GetMember<EventSymbol>(\"M10\");\n\n Assert.False(m10.IsAbstract);\n Assert.False(m10.IsVirtual);\n Assert.False(m10.IsSealed);\n Assert.True(m10.IsStatic);\n Assert.False(m10.IsExtern);\n Assert.False(m10.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m10));\n }\n\n foreach (var addAccessor in new[] { true, false })\n {\n var m01 = getAccessor(i1.GetMember<EventSymbol>(\"M01\"), addAccessor);\n\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n var m02 = getAccessor(i1.GetMember<EventSymbol>(\"M02\"), addAccessor);\n\n Assert.False(m02.IsAbstract);\n Assert.False(m02.IsVirtual);\n Assert.False(m02.IsMetadataVirtual());\n Assert.False(m02.IsSealed);\n Assert.True(m02.IsStatic);\n Assert.False(m02.IsExtern);\n Assert.False(m02.IsAsync);\n Assert.False(m02.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m02));\n\n var m03 = getAccessor(i1.GetMember<EventSymbol>(\"M03\"), addAccessor);\n\n Assert.False(m03.IsAbstract);\n Assert.False(m03.IsVirtual);\n Assert.False(m03.IsMetadataVirtual());\n Assert.False(m03.IsSealed);\n Assert.True(m03.IsStatic);\n Assert.False(m03.IsExtern);\n Assert.False(m03.IsAsync);\n Assert.False(m03.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m03));\n\n var m04 = getAccessor(i1.GetMember<EventSymbol>(\"M04\"), addAccessor);\n\n Assert.False(m04.IsAbstract);\n Assert.False(m04.IsVirtual);\n Assert.False(m04.IsMetadataVirtual());\n Assert.False(m04.IsSealed);\n Assert.True(m04.IsStatic);\n Assert.False(m04.IsExtern);\n Assert.False(m04.IsAsync);\n Assert.False(m04.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m04));\n\n var m05 = getAccessor(i1.GetMember<EventSymbol>(\"M05\"), addAccessor);\n\n Assert.True(m05.IsAbstract);\n Assert.False(m05.IsVirtual);\n Assert.True(m05.IsMetadataVirtual());\n Assert.False(m05.IsSealed);\n Assert.True(m05.IsStatic);\n Assert.False(m05.IsExtern);\n Assert.False(m05.IsAsync);\n Assert.False(m05.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m05));\n\n var m06 = getAccessor(i1.GetMember<EventSymbol>(\"M06\"), addAccessor);\n\n Assert.True(m06.IsAbstract);\n Assert.False(m06.IsVirtual);\n Assert.True(m06.IsMetadataVirtual());\n Assert.False(m06.IsSealed);\n Assert.True(m06.IsStatic);\n Assert.False(m06.IsExtern);\n Assert.False(m06.IsAsync);\n Assert.False(m06.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m06));\n\n var m07 = getAccessor(i1.GetMember<EventSymbol>(\"M07\"), addAccessor);\n\n Assert.True(m07.IsAbstract);\n Assert.False(m07.IsVirtual);\n Assert.True(m07.IsMetadataVirtual());\n Assert.False(m07.IsSealed);\n Assert.True(m07.IsStatic);\n Assert.False(m07.IsExtern);\n Assert.False(m07.IsAsync);\n Assert.False(m07.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m07));\n\n var m08 = getAccessor(i1.GetMember<EventSymbol>(\"M08\"), addAccessor);\n\n Assert.False(m08.IsAbstract);\n Assert.False(m08.IsVirtual);\n Assert.False(m08.IsMetadataVirtual());\n Assert.False(m08.IsSealed);\n Assert.True(m08.IsStatic);\n Assert.False(m08.IsExtern);\n Assert.False(m08.IsAsync);\n Assert.False(m08.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m08));\n\n var m09 = getAccessor(i1.GetMember<EventSymbol>(\"M09\"), addAccessor);\n\n Assert.False(m09.IsAbstract);\n Assert.False(m09.IsVirtual);\n Assert.False(m09.IsMetadataVirtual());\n Assert.False(m09.IsSealed);\n Assert.True(m09.IsStatic);\n Assert.False(m09.IsExtern);\n Assert.False(m09.IsAsync);\n Assert.False(m09.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m09));\n\n var m10 = getAccessor(i1.GetMember<EventSymbol>(\"M10\"), addAccessor);\n\n Assert.False(m10.IsAbstract);\n Assert.False(m10.IsVirtual);\n Assert.False(m10.IsMetadataVirtual());\n Assert.False(m10.IsSealed);\n Assert.True(m10.IsStatic);\n Assert.False(m10.IsExtern);\n Assert.False(m10.IsAsync);\n Assert.False(m10.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m10));\n }\n\n static MethodSymbol getAccessor(EventSymbol e, bool addAccessor)\n {\n return addAccessor ? e.AddMethod : e.RemoveMethod;\n }\n }\n\n [Fact]\n public void EventModifiers_02()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01 { add {} remove {} }\n \n\n virtual static event D M02 { add {} remove {} }\n \n\n sealed static event D M03 { add {} remove {} }\n \n\n override static event D M04 { add {} remove {} }\n \n\n abstract virtual static event D M05 { add {} remove {} }\n \n\n abstract sealed static event D M06 { add {} remove {} }\n \n\n abstract override static event D M07 { add {} remove {} }\n \n\n virtual sealed static event D M08 { add {} remove {} }\n \n\n virtual override static event D M09 { add {} remove {} }\n \n\n sealed override static event D M10 { add {} remove {} }\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,29): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event D M01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 29),\n // (4,33): error CS8712: 'I1.M01': abstract event cannot use event accessor syntax\n // abstract static event D M01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M01\").WithLocation(4, 33),\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (10,27): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed static event D M03 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(10, 27),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (16,37): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(16, 37),\n // (16,41): error CS8712: 'I1.M05': abstract event cannot use event accessor syntax\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M05\").WithLocation(16, 41),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (19,36): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 36),\n // (19,40): error CS8712: 'I1.M06': abstract event cannot use event accessor syntax\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M06\").WithLocation(19, 40),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (22,38): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 38),\n // (22,42): error CS8712: 'I1.M07': abstract event cannot use event accessor syntax\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M07\").WithLocation(22, 42),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (25,35): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // virtual sealed static event D M08 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36),\n // (31,36): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed override static event D M10 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n [Fact]\n public void EventModifiers_03()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01\n ;\n\n virtual static event D M02\n ;\n\n sealed static event D M03\n ;\n\n override static event D M04\n ;\n\n abstract virtual static event D M05\n ;\n\n abstract sealed static event D M06\n ;\n\n abstract override static event D M07\n ;\n\n virtual sealed static event D M08\n ;\n\n virtual override static event D M09\n ;\n\n sealed override static event D M10\n ;\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n [Fact]\n public void EventModifiers_04()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01 { add {} remove {} }\n \n\n virtual static event D M02 { add {} remove {} }\n \n\n sealed static event D M03 { add {} remove {} }\n \n\n override static event D M04 { add {} remove {} }\n \n\n abstract virtual static event D M05 { add {} remove {} }\n \n\n abstract sealed static event D M06 { add {} remove {} }\n \n\n abstract override static event D M07 { add {} remove {} }\n \n\n virtual sealed static event D M08 { add {} remove {} }\n \n\n virtual override static event D M09 { add {} remove {} }\n \n\n sealed override static event D M10 { add {} remove {} }\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS8712: 'I1.M01': abstract event cannot use event accessor syntax\n // abstract static event D M01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M01\").WithLocation(4, 33),\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (16,41): error CS8712: 'I1.M05': abstract event cannot use event accessor syntax\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M05\").WithLocation(16, 41),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (19,40): error CS8712: 'I1.M06': abstract event cannot use event accessor syntax\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M06\").WithLocation(19, 40),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (22,42): error CS8712: 'I1.M07': abstract event cannot use event accessor syntax\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M07\").WithLocation(22, 42),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n [Fact]\n public void EventModifiers_05()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01\n ;\n\n virtual static event D M02\n ;\n\n sealed static event D M03\n ;\n\n override static event D M04\n ;\n\n abstract virtual static event D M05\n ;\n\n abstract sealed static event D M06\n ;\n\n abstract override static event D M07\n ;\n\n virtual sealed static event D M08\n ;\n\n virtual override static event D M09\n ;\n\n sealed override static event D M10\n ;\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,29): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static event D M01\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 29),\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (7,28): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // virtual static event D M02\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M02\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(7, 28),\n // (10,27): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static event D M03\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 27),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (13,29): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // override static event D M04\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M04\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (16,37): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static event D M05\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 37),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (19,36): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static event D M06\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 36),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (22,38): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static event D M07\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 38),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (25,35): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static event D M08\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (28,37): error CS8703: The modifier 'static' is not valid for this item in C# 7.3. Please use language version '8.0' or greater.\n // virtual override static event D M09\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M09\").WithArguments(\"static\", \"7.3\", \"8.0\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36),\n // (31,36): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static event D M10\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n [Fact]\n public void EventModifiers_06()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\npublic interface I1\n{\n abstract static event D M01 { add {} remove {} }\n \n\n virtual static event D M02 { add {} remove {} }\n \n\n sealed static event D M03 { add {} remove {} }\n \n\n override static event D M04 { add {} remove {} }\n \n\n abstract virtual static event D M05 { add {} remove {} }\n \n\n abstract sealed static event D M06 { add {} remove {} }\n \n\n abstract override static event D M07 { add {} remove {} }\n \n\n virtual sealed static event D M08 { add {} remove {} }\n \n\n virtual override static event D M09 { add {} remove {} }\n \n\n sealed override static event D M10 { add {} remove {} }\n}\n\npublic delegate void D();\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,29): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static event D M01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 29),\n // (4,33): error CS8712: 'I1.M01': abstract event cannot use event accessor syntax\n // abstract static event D M01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M01\").WithLocation(4, 33),\n // (7,28): error CS0112: A static member cannot be marked as 'virtual'\n // virtual static event D M02 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M02\").WithArguments(\"virtual\").WithLocation(7, 28),\n // (7,28): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual static event D M02 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M02\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(7, 28),\n // (10,27): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static event D M03 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M03\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 27),\n // (13,29): error CS0106: The modifier 'override' is not valid for this item\n // override static event D M04 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M04\").WithArguments(\"override\").WithLocation(13, 29),\n // (13,29): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // override static event D M04 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M04\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(13, 29),\n // (16,37): error CS0112: A static member cannot be marked as 'virtual'\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M05\").WithArguments(\"virtual\").WithLocation(16, 37),\n // (16,37): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M05\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 37),\n // (16,41): error CS8712: 'I1.M05': abstract event cannot use event accessor syntax\n // abstract virtual static event D M05 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M05\").WithLocation(16, 41),\n // (19,36): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M06\").WithArguments(\"sealed\").WithLocation(19, 36),\n // (19,36): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M06\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 36),\n // (19,40): error CS8712: 'I1.M06': abstract event cannot use event accessor syntax\n // abstract sealed static event D M06 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M06\").WithLocation(19, 40),\n // (22,38): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M07\").WithArguments(\"override\").WithLocation(22, 38),\n // (22,38): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M07\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 38),\n // (22,42): error CS8712: 'I1.M07': abstract event cannot use event accessor syntax\n // abstract override static event D M07 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.M07\").WithLocation(22, 42),\n // (25,35): error CS0112: A static member cannot be marked as 'virtual'\n // virtual sealed static event D M08 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M08\").WithArguments(\"virtual\").WithLocation(25, 35),\n // (25,35): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static event D M08 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M08\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 35),\n // (28,37): error CS0112: A static member cannot be marked as 'virtual'\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M09\").WithArguments(\"virtual\").WithLocation(28, 37),\n // (28,37): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M09\").WithArguments(\"override\").WithLocation(28, 37),\n // (28,37): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual override static event D M09 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"M09\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(28, 37),\n // (31,36): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static event D M10 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M10\").WithArguments(\"override\").WithLocation(31, 36),\n // (31,36): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static event D M10 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M10\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 36)\n );\n\n ValidateEventModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_01()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n ; \n\n virtual static I1 operator- (I1 x)\n ; \n\n sealed static I1 operator++ (I1 x)\n ; \n\n override static I1 operator-- (I1 x)\n ; \n\n abstract virtual static I1 operator! (I1 x)\n ; \n\n abstract sealed static I1 operator~ (I1 x)\n ; \n\n abstract override static I1 operator+ (I1 x, I1 y)\n ; \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n ; \n\n virtual override static I1 operator* (I1 x, I1 y) \n ; \n\n sealed override static I1 operator/ (I1 x, I1 y)\n ; \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 32),\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (7,31): error CS0501: 'I1.operator -(I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1)\").WithLocation(7, 31),\n // (10,30): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"++\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(10, 30),\n // (10,30): error CS0501: 'I1.operator ++(I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"++\").WithArguments(\"I1.operator ++(I1)\").WithLocation(10, 30),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (13,32): error CS0501: 'I1.operator --(I1)' must declare a body because it is not marked abstract, extern, or partial\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"--\").WithArguments(\"I1.operator --(I1)\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (16,40): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (19,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"~\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (22,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (25,38): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"-\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(25, 38),\n // (25,38): error CS0501: 'I1.operator -(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1, I1)\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (28,40): error CS0501: 'I1.operator *(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"*\").WithArguments(\"I1.operator *(I1, I1)\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39),\n // (31,39): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"/\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(31, 39),\n // (31,39): error CS0501: 'I1.operator /(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"/\").WithArguments(\"I1.operator /(I1, I1)\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n private static void ValidateOperatorModifiers_01(CSharpCompilation compilation1)\n {\n var i1 = compilation1.GetTypeByMetadataName(\"I1\");\n var m01 = i1.GetMember<MethodSymbol>(\"op_UnaryPlus\");\n\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n var m02 = i1.GetMember<MethodSymbol>(\"op_UnaryNegation\");\n\n Assert.False(m02.IsAbstract);\n Assert.False(m02.IsVirtual);\n Assert.False(m02.IsMetadataVirtual());\n Assert.False(m02.IsSealed);\n Assert.True(m02.IsStatic);\n Assert.False(m02.IsExtern);\n Assert.False(m02.IsAsync);\n Assert.False(m02.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m02));\n\n var m03 = i1.GetMember<MethodSymbol>(\"op_Increment\");\n\n Assert.False(m03.IsAbstract);\n Assert.False(m03.IsVirtual);\n Assert.False(m03.IsMetadataVirtual());\n Assert.False(m03.IsSealed);\n Assert.True(m03.IsStatic);\n Assert.False(m03.IsExtern);\n Assert.False(m03.IsAsync);\n Assert.False(m03.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m03));\n\n var m04 = i1.GetMember<MethodSymbol>(\"op_Decrement\");\n\n Assert.False(m04.IsAbstract);\n Assert.False(m04.IsVirtual);\n Assert.False(m04.IsMetadataVirtual());\n Assert.False(m04.IsSealed);\n Assert.True(m04.IsStatic);\n Assert.False(m04.IsExtern);\n Assert.False(m04.IsAsync);\n Assert.False(m04.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m04));\n\n var m05 = i1.GetMember<MethodSymbol>(\"op_LogicalNot\");\n\n Assert.True(m05.IsAbstract);\n Assert.False(m05.IsVirtual);\n Assert.True(m05.IsMetadataVirtual());\n Assert.False(m05.IsSealed);\n Assert.True(m05.IsStatic);\n Assert.False(m05.IsExtern);\n Assert.False(m05.IsAsync);\n Assert.False(m05.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m05));\n\n var m06 = i1.GetMember<MethodSymbol>(\"op_OnesComplement\");\n\n Assert.True(m06.IsAbstract);\n Assert.False(m06.IsVirtual);\n Assert.True(m06.IsMetadataVirtual());\n Assert.False(m06.IsSealed);\n Assert.True(m06.IsStatic);\n Assert.False(m06.IsExtern);\n Assert.False(m06.IsAsync);\n Assert.False(m06.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m06));\n\n var m07 = i1.GetMember<MethodSymbol>(\"op_Addition\");\n\n Assert.True(m07.IsAbstract);\n Assert.False(m07.IsVirtual);\n Assert.True(m07.IsMetadataVirtual());\n Assert.False(m07.IsSealed);\n Assert.True(m07.IsStatic);\n Assert.False(m07.IsExtern);\n Assert.False(m07.IsAsync);\n Assert.False(m07.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m07));\n\n var m08 = i1.GetMember<MethodSymbol>(\"op_Subtraction\");\n\n Assert.False(m08.IsAbstract);\n Assert.False(m08.IsVirtual);\n Assert.False(m08.IsMetadataVirtual());\n Assert.False(m08.IsSealed);\n Assert.True(m08.IsStatic);\n Assert.False(m08.IsExtern);\n Assert.False(m08.IsAsync);\n Assert.False(m08.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m08));\n\n var m09 = i1.GetMember<MethodSymbol>(\"op_Multiply\");\n\n Assert.False(m09.IsAbstract);\n Assert.False(m09.IsVirtual);\n Assert.False(m09.IsMetadataVirtual());\n Assert.False(m09.IsSealed);\n Assert.True(m09.IsStatic);\n Assert.False(m09.IsExtern);\n Assert.False(m09.IsAsync);\n Assert.False(m09.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m09));\n\n var m10 = i1.GetMember<MethodSymbol>(\"op_Division\");\n\n Assert.False(m10.IsAbstract);\n Assert.False(m10.IsVirtual);\n Assert.False(m10.IsMetadataVirtual());\n Assert.False(m10.IsSealed);\n Assert.True(m10.IsStatic);\n Assert.False(m10.IsExtern);\n Assert.False(m10.IsAsync);\n Assert.False(m10.IsOverride);\n Assert.Null(i1.FindImplementationForInterfaceMember(m10));\n }\n\n [Fact]\n public void OperatorModifiers_02()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n {throw null;} \n\n virtual static I1 operator- (I1 x)\n {throw null;} \n\n sealed static I1 operator++ (I1 x)\n {throw null;} \n\n override static I1 operator-- (I1 x)\n {throw null;} \n\n abstract virtual static I1 operator! (I1 x)\n {throw null;} \n\n abstract sealed static I1 operator~ (I1 x)\n {throw null;} \n\n abstract override static I1 operator+ (I1 x, I1 y)\n {throw null;} \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n {throw null;} \n\n virtual override static I1 operator* (I1 x, I1 y) \n {throw null;} \n\n sealed override static I1 operator/ (I1 x, I1 y)\n {throw null;} \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 32),\n // (4,32): error CS0500: 'I1.operator +(I1)' cannot declare a body because it is marked abstract\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1)\").WithLocation(4, 32),\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (10,30): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"++\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(10, 30),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (16,40): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(16, 40),\n // (16,40): error CS0500: 'I1.operator !(I1)' cannot declare a body because it is marked abstract\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!\").WithArguments(\"I1.operator !(I1)\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (19,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"~\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 39),\n // (19,39): error CS0500: 'I1.operator ~(I1)' cannot declare a body because it is marked abstract\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"~\").WithArguments(\"I1.operator ~(I1)\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (22,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 41),\n // (22,41): error CS0500: 'I1.operator +(I1, I1)' cannot declare a body because it is marked abstract\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1, I1)\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (25,38): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"-\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39),\n // (31,39): error CS8703: The modifier 'sealed' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"/\").WithArguments(\"sealed\", \"9.0\", \"preview\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n ; \n\n virtual static I1 operator- (I1 x)\n ; \n\n sealed static I1 operator++ (I1 x)\n ; \n\n override static I1 operator-- (I1 x)\n ; \n\n abstract virtual static I1 operator! (I1 x)\n ; \n\n abstract sealed static I1 operator~ (I1 x)\n ; \n\n abstract override static I1 operator+ (I1 x, I1 y)\n ; \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n ; \n\n virtual override static I1 operator* (I1 x, I1 y) \n ; \n\n sealed override static I1 operator/ (I1 x, I1 y)\n ; \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (7,31): error CS0501: 'I1.operator -(I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1)\").WithLocation(7, 31),\n // (10,30): error CS0501: 'I1.operator ++(I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"++\").WithArguments(\"I1.operator ++(I1)\").WithLocation(10, 30),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (13,32): error CS0501: 'I1.operator --(I1)' must declare a body because it is not marked abstract, extern, or partial\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"--\").WithArguments(\"I1.operator --(I1)\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (25,38): error CS0501: 'I1.operator -(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1, I1)\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (28,40): error CS0501: 'I1.operator *(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"*\").WithArguments(\"I1.operator *(I1, I1)\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39),\n // (31,39): error CS0501: 'I1.operator /(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"/\").WithArguments(\"I1.operator /(I1, I1)\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n {throw null;} \n\n virtual static I1 operator- (I1 x)\n {throw null;} \n\n sealed static I1 operator++ (I1 x)\n {throw null;} \n\n override static I1 operator-- (I1 x)\n {throw null;} \n\n abstract virtual static I1 operator! (I1 x)\n {throw null;} \n\n abstract sealed static I1 operator~ (I1 x)\n {throw null;} \n\n abstract override static I1 operator+ (I1 x, I1 y)\n {throw null;} \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n {throw null;} \n\n virtual override static I1 operator* (I1 x, I1 y) \n {throw null;} \n\n sealed override static I1 operator/ (I1 x, I1 y)\n {throw null;} \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS0500: 'I1.operator +(I1)' cannot declare a body because it is marked abstract\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1)\").WithLocation(4, 32),\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (16,40): error CS0500: 'I1.operator !(I1)' cannot declare a body because it is marked abstract\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!\").WithArguments(\"I1.operator !(I1)\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (19,39): error CS0500: 'I1.operator ~(I1)' cannot declare a body because it is marked abstract\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"~\").WithArguments(\"I1.operator ~(I1)\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (22,41): error CS0500: 'I1.operator +(I1, I1)' cannot declare a body because it is marked abstract\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1, I1)\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_05()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n ; \n\n virtual static I1 operator- (I1 x)\n ; \n\n sealed static I1 operator++ (I1 x)\n ; \n\n override static I1 operator-- (I1 x)\n ; \n\n abstract virtual static I1 operator! (I1 x)\n ; \n\n abstract sealed static I1 operator~ (I1 x)\n ; \n\n abstract override static I1 operator+ (I1 x, I1 y)\n ; \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n ; \n\n virtual override static I1 operator* (I1 x, I1 y) \n ; \n\n sealed override static I1 operator/ (I1 x, I1 y)\n ; \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 32),\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (7,31): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"-\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(7, 31),\n // (7,31): error CS0501: 'I1.operator -(I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1)\").WithLocation(7, 31),\n // (10,30): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"++\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 30),\n // (10,30): error CS0501: 'I1.operator ++(I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"++\").WithArguments(\"I1.operator ++(I1)\").WithLocation(10, 30),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (13,32): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"--\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(13, 32),\n // (13,32): error CS0501: 'I1.operator --(I1)' must declare a body because it is not marked abstract, extern, or partial\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"--\").WithArguments(\"I1.operator --(I1)\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (16,40): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (19,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"~\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (22,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (25,38): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"-\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 38),\n // (25,38): error CS0501: 'I1.operator -(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"-\").WithArguments(\"I1.operator -(I1, I1)\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (28,40): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"*\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(28, 40),\n // (28,40): error CS0501: 'I1.operator *(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"*\").WithArguments(\"I1.operator *(I1, I1)\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39),\n // (31,39): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"/\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 39),\n // (31,39): error CS0501: 'I1.operator /(I1, I1)' must declare a body because it is not marked abstract, extern, or partial\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"/\").WithArguments(\"I1.operator /(I1, I1)\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator+ (I1 x)\n {throw null;} \n\n virtual static I1 operator- (I1 x)\n {throw null;} \n\n sealed static I1 operator++ (I1 x)\n {throw null;} \n\n override static I1 operator-- (I1 x)\n {throw null;} \n\n abstract virtual static I1 operator! (I1 x)\n {throw null;} \n\n abstract sealed static I1 operator~ (I1 x)\n {throw null;} \n\n abstract override static I1 operator+ (I1 x, I1 y)\n {throw null;} \n\n virtual sealed static I1 operator- (I1 x, I1 y)\n {throw null;} \n\n virtual override static I1 operator* (I1 x, I1 y) \n {throw null;} \n\n sealed override static I1 operator/ (I1 x, I1 y)\n {throw null;} \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 32),\n // (4,32): error CS0500: 'I1.operator +(I1)' cannot declare a body because it is marked abstract\n // abstract static I1 operator+ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1)\").WithLocation(4, 32),\n // (7,31): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(7, 31),\n // (7,31): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual static I1 operator- (I1 x)\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"-\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(7, 31),\n // (10,30): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed static I1 operator++ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"++\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(10, 30),\n // (13,32): error CS0106: The modifier 'override' is not valid for this item\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"--\").WithArguments(\"override\").WithLocation(13, 32),\n // (13,32): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // override static I1 operator-- (I1 x)\n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"--\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(13, 32),\n // (16,40): error CS0106: The modifier 'virtual' is not valid for this item\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!\").WithArguments(\"virtual\").WithLocation(16, 40),\n // (16,40): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(16, 40),\n // (16,40): error CS0500: 'I1.operator !(I1)' cannot declare a body because it is marked abstract\n // abstract virtual static I1 operator! (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!\").WithArguments(\"I1.operator !(I1)\").WithLocation(16, 40),\n // (19,39): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"~\").WithArguments(\"sealed\").WithLocation(19, 39),\n // (19,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"~\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(19, 39),\n // (19,39): error CS0500: 'I1.operator ~(I1)' cannot declare a body because it is marked abstract\n // abstract sealed static I1 operator~ (I1 x)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"~\").WithArguments(\"I1.operator ~(I1)\").WithLocation(19, 39),\n // (22,41): error CS0106: The modifier 'override' is not valid for this item\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"override\").WithLocation(22, 41),\n // (22,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"+\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(22, 41),\n // (22,41): error CS0500: 'I1.operator +(I1, I1)' cannot declare a body because it is marked abstract\n // abstract override static I1 operator+ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"+\").WithArguments(\"I1.operator +(I1, I1)\").WithLocation(22, 41),\n // (25,38): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"-\").WithArguments(\"virtual\").WithLocation(25, 38),\n // (25,38): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // virtual sealed static I1 operator- (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"-\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(25, 38),\n // (28,40): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"virtual\").WithLocation(28, 40),\n // (28,40): error CS0106: The modifier 'override' is not valid for this item\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"*\").WithArguments(\"override\").WithLocation(28, 40),\n // (28,40): error CS8370: Feature 'default interface implementation' is not available in C# 7.3. Please use language version 8.0 or greater.\n // virtual override static I1 operator* (I1 x, I1 y) \n Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion7_3, \"*\").WithArguments(\"default interface implementation\", \"8.0\").WithLocation(28, 40),\n // (31,39): error CS0106: The modifier 'override' is not valid for this item\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"/\").WithArguments(\"override\").WithLocation(31, 39),\n // (31,39): error CS8703: The modifier 'sealed' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // sealed override static I1 operator/ (I1 x, I1 y)\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"/\").WithArguments(\"sealed\", \"7.3\", \"preview\").WithLocation(31, 39)\n );\n\n ValidateOperatorModifiers_01(compilation1);\n }\n\n [Fact]\n public void OperatorModifiers_07()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator== (I1 x, I1 y); \n\n abstract static bool operator!= (I1 x, I1 y) {return false;} \n}\n\npublic interface I2\n{\n sealed static bool operator== (I2 x, I2 y);\n\n sealed static bool operator!= (I2 x, I2 y) {return false;} \n}\n\npublic interface I3\n{\n abstract sealed static bool operator== (I3 x, I3 y);\n\n abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static bool operator== (I1 x, I1 y); \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"==\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 34),\n // (6,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static bool operator!= (I1 x, I1 y) {return false;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!=\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(6, 34),\n // (6,34): error CS0500: 'I1.operator !=(I1, I1)' cannot declare a body because it is marked abstract\n // abstract static bool operator!= (I1 x, I1 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I1.operator !=(I1, I1)\").WithLocation(6, 34),\n // (11,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(11, 32),\n // (11,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"==\").WithLocation(11, 32),\n // (13,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(13, 32),\n // (13,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"!=\").WithLocation(13, 32),\n // (18,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator== (I3 x, I3 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(18, 41),\n // (18,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static bool operator== (I3 x, I3 y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"==\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(18, 41),\n // (20,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(20, 41),\n // (20,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!=\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(20, 41),\n // (20,41): error CS0500: 'I3.operator !=(I3, I3)' cannot declare a body because it is marked abstract\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I3.operator !=(I3, I3)\").WithLocation(20, 41)\n );\n\n validate();\n\n compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator== (I1 x, I1 y); \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"==\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 34),\n // (6,34): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator!= (I1 x, I1 y) {return false;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!=\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(6, 34),\n // (6,34): error CS0500: 'I1.operator !=(I1, I1)' cannot declare a body because it is marked abstract\n // abstract static bool operator!= (I1 x, I1 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I1.operator !=(I1, I1)\").WithLocation(6, 34),\n // (11,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(11, 32),\n // (11,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"==\").WithLocation(11, 32),\n // (13,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(13, 32),\n // (13,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"!=\").WithLocation(13, 32),\n // (18,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator== (I3 x, I3 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(18, 41),\n // (18,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static bool operator== (I3 x, I3 y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"==\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(18, 41),\n // (20,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(20, 41),\n // (20,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!=\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(20, 41),\n // (20,41): error CS0500: 'I3.operator !=(I3, I3)' cannot declare a body because it is marked abstract\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I3.operator !=(I3, I3)\").WithLocation(20, 41)\n );\n\n validate();\n\n compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (6,34): error CS0500: 'I1.operator !=(I1, I1)' cannot declare a body because it is marked abstract\n // abstract static bool operator!= (I1 x, I1 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I1.operator !=(I1, I1)\").WithLocation(6, 34),\n // (11,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(11, 32),\n // (11,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator== (I2 x, I2 y);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"==\").WithLocation(11, 32),\n // (13,32): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(13, 32),\n // (13,32): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static bool operator!= (I2 x, I2 y) {return false;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"!=\").WithLocation(13, 32),\n // (18,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator== (I3 x, I3 y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"==\").WithArguments(\"sealed\").WithLocation(18, 41),\n // (20,41): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"!=\").WithArguments(\"sealed\").WithLocation(20, 41),\n // (20,41): error CS0500: 'I3.operator !=(I3, I3)' cannot declare a body because it is marked abstract\n // abstract sealed static bool operator!= (I3 x, I3 y) {return false;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"!=\").WithArguments(\"I3.operator !=(I3, I3)\").WithLocation(20, 41)\n );\n\n validate();\n\n void validate()\n {\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I1\").GetMembers())\n {\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I2\").GetMembers())\n {\n Assert.False(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I3\").GetMembers())\n {\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n }\n }\n\n [Fact]\n public void OperatorModifiers_08()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static implicit operator int(I1 x); \n\n abstract static explicit operator I1(bool x) {return null;} \n}\n\npublic interface I2\n{\n sealed static implicit operator int(I2 x);\n\n sealed static explicit operator I2(bool x) {return null;} \n}\n\npublic interface I3\n{\n abstract sealed static implicit operator int(I3 x);\n\n abstract sealed static explicit operator I3(bool x) {return null;} \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular7_3,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static implicit operator int(I1 x); \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(4, 39),\n // (4,39): error CS0552: 'I1.implicit operator int(I1)': user-defined conversions to or from an interface are not allowed\n // abstract static implicit operator int(I1 x); \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I1.implicit operator int(I1)\").WithLocation(4, 39),\n // (6,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"I1\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(6, 39),\n // (6,39): error CS0500: 'I1.explicit operator I1(bool)' cannot declare a body because it is marked abstract\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (6,39): error CS0552: 'I1.explicit operator I1(bool)': user-defined conversions to or from an interface are not allowed\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (11,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(11, 37),\n // (11,37): error CS0552: 'I2.implicit operator int(I2)': user-defined conversions to or from an interface are not allowed\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I2.implicit operator int(I2)\").WithLocation(11, 37),\n // (11,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(11, 37),\n // (13,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I2\").WithArguments(\"sealed\").WithLocation(13, 37),\n // (13,37): error CS0552: 'I2.explicit operator I2(bool)': user-defined conversions to or from an interface are not allowed\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I2\").WithArguments(\"I2.explicit operator I2(bool)\").WithLocation(13, 37),\n // (13,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"I2\").WithLocation(13, 37),\n // (18,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(18, 46),\n // (18,46): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(18, 46),\n // (18,46): error CS0552: 'I3.implicit operator int(I3)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I3.implicit operator int(I3)\").WithLocation(18, 46),\n // (20,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I3\").WithArguments(\"sealed\").WithLocation(20, 46),\n // (20,46): error CS8703: The modifier 'abstract' is not valid for this item in C# 7.3. Please use language version 'preview' or greater.\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"I3\").WithArguments(\"abstract\", \"7.3\", \"preview\").WithLocation(20, 46),\n // (20,46): error CS0500: 'I3.explicit operator I3(bool)' cannot declare a body because it is marked abstract\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46),\n // (20,46): error CS0552: 'I3.explicit operator I3(bool)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46)\n );\n\n validate();\n\n compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static implicit operator int(I1 x); \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(4, 39),\n // (4,39): error CS0552: 'I1.implicit operator int(I1)': user-defined conversions to or from an interface are not allowed\n // abstract static implicit operator int(I1 x); \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I1.implicit operator int(I1)\").WithLocation(4, 39),\n // (6,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"I1\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(6, 39),\n // (6,39): error CS0500: 'I1.explicit operator I1(bool)' cannot declare a body because it is marked abstract\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (6,39): error CS0552: 'I1.explicit operator I1(bool)': user-defined conversions to or from an interface are not allowed\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (11,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(11, 37),\n // (11,37): error CS0552: 'I2.implicit operator int(I2)': user-defined conversions to or from an interface are not allowed\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I2.implicit operator int(I2)\").WithLocation(11, 37),\n // (11,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(11, 37),\n // (13,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I2\").WithArguments(\"sealed\").WithLocation(13, 37),\n // (13,37): error CS0552: 'I2.explicit operator I2(bool)': user-defined conversions to or from an interface are not allowed\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I2\").WithArguments(\"I2.explicit operator I2(bool)\").WithLocation(13, 37),\n // (13,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"I2\").WithLocation(13, 37),\n // (18,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(18, 46),\n // (18,46): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(18, 46),\n // (18,46): error CS0552: 'I3.implicit operator int(I3)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I3.implicit operator int(I3)\").WithLocation(18, 46),\n // (20,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I3\").WithArguments(\"sealed\").WithLocation(20, 46),\n // (20,46): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"I3\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(20, 46),\n // (20,46): error CS0500: 'I3.explicit operator I3(bool)' cannot declare a body because it is marked abstract\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46),\n // (20,46): error CS0552: 'I3.explicit operator I3(bool)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46)\n );\n\n validate();\n\n compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,39): error CS0552: 'I1.implicit operator int(I1)': user-defined conversions to or from an interface are not allowed\n // abstract static implicit operator int(I1 x); \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I1.implicit operator int(I1)\").WithLocation(4, 39),\n // (6,39): error CS0500: 'I1.explicit operator I1(bool)' cannot declare a body because it is marked abstract\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (6,39): error CS0552: 'I1.explicit operator I1(bool)': user-defined conversions to or from an interface are not allowed\n // abstract static explicit operator I1(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I1\").WithArguments(\"I1.explicit operator I1(bool)\").WithLocation(6, 39),\n // (11,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(11, 37),\n // (11,37): error CS0552: 'I2.implicit operator int(I2)': user-defined conversions to or from an interface are not allowed\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I2.implicit operator int(I2)\").WithLocation(11, 37),\n // (11,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static implicit operator int(I2 x);\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(11, 37),\n // (13,37): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I2\").WithArguments(\"sealed\").WithLocation(13, 37),\n // (13,37): error CS0552: 'I2.explicit operator I2(bool)': user-defined conversions to or from an interface are not allowed\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I2\").WithArguments(\"I2.explicit operator I2(bool)\").WithLocation(13, 37),\n // (13,37): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // sealed static explicit operator I2(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"I2\").WithLocation(13, 37),\n // (18,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(18, 46),\n // (18,46): error CS0552: 'I3.implicit operator int(I3)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static implicit operator int(I3 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"int\").WithArguments(\"I3.implicit operator int(I3)\").WithLocation(18, 46),\n // (20,46): error CS0106: The modifier 'sealed' is not valid for this item\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"I3\").WithArguments(\"sealed\").WithLocation(20, 46),\n // (20,46): error CS0500: 'I3.explicit operator I3(bool)' cannot declare a body because it is marked abstract\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_AbstractHasBody, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46),\n // (20,46): error CS0552: 'I3.explicit operator I3(bool)': user-defined conversions to or from an interface are not allowed\n // abstract sealed static explicit operator I3(bool x) {return null;} \n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I3\").WithArguments(\"I3.explicit operator I3(bool)\").WithLocation(20, 46)\n );\n\n validate();\n\n void validate()\n {\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I1\").GetMembers())\n {\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I2\").GetMembers())\n {\n Assert.False(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n\n foreach (MethodSymbol m01 in compilation1.GetTypeByMetadataName(\"I3\").GetMembers())\n {\n Assert.True(m01.IsAbstract);\n Assert.False(m01.IsVirtual);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsExtern);\n Assert.False(m01.IsAsync);\n Assert.False(m01.IsOverride);\n Assert.Null(m01.ContainingType.FindImplementationForInterfaceMember(m01));\n }\n }\n }\n\n [Fact]\n public void FieldModifiers_01()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int F1; \n sealed static int F2; \n abstract int F3; \n sealed int F4; \n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,25): error CS0681: The modifier 'abstract' is not valid on fields. Try using a property instead.\n // abstract static int F1; \n Diagnostic(ErrorCode.ERR_AbstractField, \"F1\").WithLocation(4, 25),\n // (5,23): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static int F2; \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"F2\").WithArguments(\"sealed\").WithLocation(5, 23),\n // (6,18): error CS0681: The modifier 'abstract' is not valid on fields. Try using a property instead.\n // abstract int F3; \n Diagnostic(ErrorCode.ERR_AbstractField, \"F3\").WithLocation(6, 18),\n // (6,18): error CS0525: Interfaces cannot contain instance fields\n // abstract int F3; \n Diagnostic(ErrorCode.ERR_InterfacesCantContainFields, \"F3\").WithLocation(6, 18),\n // (7,16): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed int F4; \n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"F4\").WithArguments(\"sealed\").WithLocation(7, 16),\n // (7,16): error CS0525: Interfaces cannot contain instance fields\n // sealed int F4; \n Diagnostic(ErrorCode.ERR_InterfacesCantContainFields, \"F4\").WithLocation(7, 16)\n );\n }\n\n [Fact]\n public void ExternAbstractStatic_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n extern abstract static void M01();\n extern abstract static bool P01 { get; }\n extern abstract static event System.Action E01;\n extern abstract static I1 operator+ (I1 x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS0180: 'I1.M01()' cannot be both extern and abstract\n // extern abstract static void M01();\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"M01\").WithArguments(\"I1.M01()\").WithLocation(4, 33),\n // (5,33): error CS0180: 'I1.P01' cannot be both extern and abstract\n // extern abstract static bool P01 { get; }\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"P01\").WithArguments(\"I1.P01\").WithLocation(5, 33),\n // (6,48): error CS0180: 'I1.E01' cannot be both extern and abstract\n // extern abstract static event System.Action E01;\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"E01\").WithArguments(\"I1.E01\").WithLocation(6, 48),\n // (7,39): error CS0180: 'I1.operator +(I1)' cannot be both extern and abstract\n // extern abstract static I1 operator+ (I1 x);\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"+\").WithArguments(\"I1.operator +(I1)\").WithLocation(7, 39)\n );\n }\n\n [Fact]\n public void ExternAbstractStatic_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n extern abstract static void M01() {}\n extern abstract static bool P01 { get => false; }\n extern abstract static event System.Action E01 { add {} remove {} }\n extern abstract static I1 operator+ (I1 x) => null;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS0180: 'I1.M01()' cannot be both extern and abstract\n // extern abstract static void M01() {}\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"M01\").WithArguments(\"I1.M01()\").WithLocation(4, 33),\n // (5,33): error CS0180: 'I1.P01' cannot be both extern and abstract\n // extern abstract static bool P01 { get => false; }\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"P01\").WithArguments(\"I1.P01\").WithLocation(5, 33),\n // (6,48): error CS0180: 'I1.E01' cannot be both extern and abstract\n // extern abstract static event System.Action E01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"E01\").WithArguments(\"I1.E01\").WithLocation(6, 48),\n // (6,52): error CS8712: 'I1.E01': abstract event cannot use event accessor syntax\n // extern abstract static event System.Action E01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_AbstractEventHasAccessors, \"{\").WithArguments(\"I1.E01\").WithLocation(6, 52),\n // (7,39): error CS0180: 'I1.operator +(I1)' cannot be both extern and abstract\n // extern abstract static I1 operator+ (I1 x) => null;\n Diagnostic(ErrorCode.ERR_AbstractAndExtern, \"+\").WithArguments(\"I1.operator +(I1)\").WithLocation(7, 39)\n );\n }\n\n [Fact]\n public void ExternSealedStatic_01()\n {\n var source1 =\n@\"\n#pragma warning disable CS0626 // Method, operator, or accessor is marked external and has no attributes on it. Consider adding a DllImport attribute to specify the external implementation.\n\ninterface I1\n{\n extern sealed static void M01();\n extern sealed static bool P01 { get; }\n extern sealed static event System.Action E01;\n extern sealed static I1 operator+ (I1 x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Fact]\n public void AbstractStaticInClass_01()\n {\n var source1 =\n@\"\nabstract class C1\n{\n public abstract static void M01();\n public abstract static bool P01 { get; }\n public abstract static event System.Action E01;\n public abstract static C1 operator+ (C1 x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static void M01();\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M01\").WithArguments(\"abstract\").WithLocation(4, 33),\n // (5,33): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static bool P01 { get; }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"P01\").WithArguments(\"abstract\").WithLocation(5, 33),\n // (6,48): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static event System.Action E01;\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"E01\").WithArguments(\"abstract\").WithLocation(6, 48),\n // (7,39): error CS0106: The modifier 'abstract' is not valid for this item\n // public abstract static C1 operator+ (C1 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"abstract\").WithLocation(7, 39),\n // (7,39): error CS0501: 'C1.operator +(C1)' must declare a body because it is not marked abstract, extern, or partial\n // public abstract static C1 operator+ (C1 x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"+\").WithArguments(\"C1.operator +(C1)\").WithLocation(7, 39)\n );\n }\n\n [Fact]\n public void SealedStaticInClass_01()\n {\n var source1 =\n@\"\nclass C1\n{\n sealed static void M01() {}\n sealed static bool P01 { get => false; }\n sealed static event System.Action E01 { add {} remove {} }\n public sealed static C1 operator+ (C1 x) => null;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,24): error CS0238: 'C1.M01()' cannot be sealed because it is not an override\n // sealed static void M01() {}\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"M01\").WithArguments(\"C1.M01()\").WithLocation(4, 24),\n // (5,24): error CS0238: 'C1.P01' cannot be sealed because it is not an override\n // sealed static bool P01 { get => false; }\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"P01\").WithArguments(\"C1.P01\").WithLocation(5, 24),\n // (6,39): error CS0238: 'C1.E01' cannot be sealed because it is not an override\n // sealed static event System.Action E01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"E01\").WithArguments(\"C1.E01\").WithLocation(6, 39),\n // (7,37): error CS0106: The modifier 'sealed' is not valid for this item\n // public sealed static C1 operator+ (C1 x) => null;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"sealed\").WithLocation(7, 37)\n );\n }\n\n [Fact]\n public void AbstractStaticInStruct_01()\n {\n var source1 =\n@\"\nstruct C1\n{\n public abstract static void M01();\n public abstract static bool P01 { get; }\n public abstract static event System.Action E01;\n public abstract static C1 operator+ (C1 x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static void M01();\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"M01\").WithArguments(\"abstract\").WithLocation(4, 33),\n // (5,33): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static bool P01 { get; }\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"P01\").WithArguments(\"abstract\").WithLocation(5, 33),\n // (6,48): error CS0112: A static member cannot be marked as 'abstract'\n // public abstract static event System.Action E01;\n Diagnostic(ErrorCode.ERR_StaticNotVirtual, \"E01\").WithArguments(\"abstract\").WithLocation(6, 48),\n // (7,39): error CS0106: The modifier 'abstract' is not valid for this item\n // public abstract static C1 operator+ (C1 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"abstract\").WithLocation(7, 39),\n // (7,39): error CS0501: 'C1.operator +(C1)' must declare a body because it is not marked abstract, extern, or partial\n // public abstract static C1 operator+ (C1 x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"+\").WithArguments(\"C1.operator +(C1)\").WithLocation(7, 39)\n );\n }\n\n [Fact]\n public void SealedStaticInStruct_01()\n {\n var source1 =\n@\"\nstruct C1\n{\n sealed static void M01() {}\n sealed static bool P01 { get => false; }\n sealed static event System.Action E01 { add {} remove {} }\n public sealed static C1 operator+ (C1 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,24): error CS0238: 'C1.M01()' cannot be sealed because it is not an override\n // sealed static void M01() {}\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"M01\").WithArguments(\"C1.M01()\").WithLocation(4, 24),\n // (5,24): error CS0238: 'C1.P01' cannot be sealed because it is not an override\n // sealed static bool P01 { get => false; }\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"P01\").WithArguments(\"C1.P01\").WithLocation(5, 24),\n // (6,39): error CS0238: 'C1.E01' cannot be sealed because it is not an override\n // sealed static event System.Action E01 { add {} remove {} }\n Diagnostic(ErrorCode.ERR_SealedNonOverride, \"E01\").WithArguments(\"C1.E01\").WithLocation(6, 39),\n // (7,37): error CS0106: The modifier 'sealed' is not valid for this item\n // public sealed static C1 operator+ (C1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"+\").WithArguments(\"sealed\").WithLocation(7, 37)\n );\n }\n\n [Fact]\n public void DefineAbstractStaticMethod_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n Assert.True(compilation1.Assembly.RuntimeSupportsDefaultInterfaceImplementation);\n Assert.True(compilation1.Assembly.RuntimeSupportsStaticAbstractMembersInInterfaces);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n }\n }\n\n [Fact]\n public void DefineAbstractStaticMethod_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 26)\n );\n\n Assert.False(compilation1.Assembly.RuntimeSupportsDefaultInterfaceImplementation);\n Assert.False(compilation1.Assembly.RuntimeSupportsStaticAbstractMembersInInterfaces);\n\n var compilation2 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.Net50);\n\n compilation2.VerifyDiagnostics(\n // (4,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 26)\n );\n\n Assert.True(compilation2.Assembly.RuntimeSupportsDefaultInterfaceImplementation);\n Assert.False(compilation2.Assembly.RuntimeSupportsStaticAbstractMembersInInterfaces);\n }\n\n [Theory]\n [InlineData(\"I1\", \"+\", \"(I1 x)\")]\n [InlineData(\"I1\", \"-\", \"(I1 x)\")]\n [InlineData(\"I1\", \"!\", \"(I1 x)\")]\n [InlineData(\"I1\", \"~\", \"(I1 x)\")]\n [InlineData(\"I1\", \"++\", \"(I1 x)\")]\n [InlineData(\"I1\", \"--\", \"(I1 x)\")]\n [InlineData(\"I1\", \"+\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"-\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"*\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"/\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"%\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"&\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"|\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"^\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"<<\", \"(I1 x, int y)\")]\n [InlineData(\"I1\", \">>\", \"(I1 x, int y)\")]\n public void DefineAbstractStaticOperator_01(string type, string op, string paramList)\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static \" + type + \" operator \" + op + \" \" + paramList + @\";\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n }\n }\n\n [Fact]\n public void DefineAbstractStaticOperator_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n abstract static I1 operator > (I1 x, I1 y);\n abstract static I1 operator < (I1 x, I1 y);\n abstract static I1 operator >= (I1 x, I1 y);\n abstract static I1 operator <= (I1 x, I1 y);\n abstract static I1 operator == (I1 x, I1 y);\n abstract static I1 operator != (I1 x, I1 y);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n int count = 0;\n foreach (var m01 in module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>())\n {\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n\n count++;\n }\n\n Assert.Equal(8, count);\n }\n }\n\n [Theory]\n [InlineData(\"I1\", \"+\", \"(I1 x)\")]\n [InlineData(\"I1\", \"-\", \"(I1 x)\")]\n [InlineData(\"I1\", \"!\", \"(I1 x)\")]\n [InlineData(\"I1\", \"~\", \"(I1 x)\")]\n [InlineData(\"I1\", \"++\", \"(I1 x)\")]\n [InlineData(\"I1\", \"--\", \"(I1 x)\")]\n [InlineData(\"I1\", \"+\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"-\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"*\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"/\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"%\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"&\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"|\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"^\", \"(I1 x, I1 y)\")]\n [InlineData(\"I1\", \"<<\", \"(I1 x, int y)\")]\n [InlineData(\"I1\", \">>\", \"(I1 x, int y)\")]\n public void DefineAbstractStaticOperator_03(string type, string op, string paramList)\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static \" + type + \" operator \" + op + \" \" + paramList + @\";\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator + (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(4, 31 + type.Length)\n );\n }\n\n [Fact]\n public void DefineAbstractStaticOperator_04()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n abstract static I1 operator > (I1 x, I1 y);\n abstract static I1 operator < (I1 x, I1 y);\n abstract static I1 operator >= (I1 x, I1 y);\n abstract static I1 operator <= (I1 x, I1 y);\n abstract static I1 operator == (I1 x, I1 y);\n abstract static I1 operator != (I1 x, I1 y);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"true\").WithLocation(4, 35),\n // (5,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"false\").WithLocation(5, 35),\n // (6,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator > (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \">\").WithLocation(6, 33),\n // (7,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator < (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"<\").WithLocation(7, 33),\n // (8,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator >= (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \">=\").WithLocation(8, 33),\n // (9,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator <= (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"<=\").WithLocation(9, 33),\n // (10,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator == (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"==\").WithLocation(10, 33),\n // (11,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator != (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"!=\").WithLocation(11, 33)\n );\n }\n\n [Fact]\n public void DefineAbstractStaticConversion_01()\n {\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static implicit operator int(T x);\n abstract static explicit operator T(int x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n int count = 0;\n foreach (var m01 in module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>())\n {\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n\n count++;\n }\n\n Assert.Equal(2, count);\n }\n }\n\n [Fact]\n public void DefineAbstractStaticConversion_03()\n {\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static implicit operator int(T x);\n abstract static explicit operator T(int x);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static implicit operator int(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(4, 39),\n // (5,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static explicit operator T(int x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T\").WithLocation(5, 39)\n );\n }\n\n [Fact]\n public void DefineAbstractStaticProperty_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var p01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.True(p01.IsAbstract);\n Assert.False(p01.IsVirtual);\n Assert.False(p01.IsSealed);\n Assert.True(p01.IsStatic);\n Assert.False(p01.IsOverride);\n\n int count = 0;\n foreach (var m01 in module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>())\n {\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n\n count++;\n }\n\n Assert.Equal(2, count);\n }\n }\n\n [Fact]\n public void DefineAbstractStaticProperty_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(4, 31),\n // (4,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(4, 36)\n );\n }\n\n [Fact]\n public void DefineAbstractStaticEvent_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static event System.Action E01;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var e01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<EventSymbol>().Single();\n\n Assert.True(e01.IsAbstract);\n Assert.False(e01.IsVirtual);\n Assert.False(e01.IsSealed);\n Assert.True(e01.IsStatic);\n Assert.False(e01.IsOverride);\n\n int count = 0;\n foreach (var m01 in module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>())\n {\n Assert.False(m01.IsMetadataNewSlot());\n Assert.True(m01.IsAbstract);\n Assert.True(m01.IsMetadataVirtual());\n Assert.False(m01.IsMetadataFinal);\n Assert.False(m01.IsVirtual);\n Assert.False(m01.IsSealed);\n Assert.True(m01.IsStatic);\n Assert.False(m01.IsOverride);\n\n count++;\n }\n\n Assert.Equal(2, count);\n }\n }\n\n [Fact]\n public void DefineAbstractStaticEvent_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static event System.Action E01;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation1.VerifyDiagnostics(\n // (4,41): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static event System.Action E01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"E01\").WithLocation(4, 41)\n );\n }\n\n [Fact]\n public void ConstraintChecks_01()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\npublic interface I2 : I1\n{\n}\n\npublic interface I3 : I2\n{\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var source2 =\n@\"\nclass C1<T1> where T1 : I1\n{\n void Test(C1<I2> x)\n {\n }\n}\n\nclass C2\n{\n void M<T2>() where T2 : I1 {}\n\n void Test(C2 x)\n {\n x.M<I2>();\n }\n}\n\nclass C3<T3> where T3 : I2\n{\n void Test(C3<I2> x, C3<I3> y)\n {\n }\n}\n\nclass C4\n{\n void M<T4>() where T4 : I2 {}\n\n void Test(C4 x)\n {\n x.M<I2>();\n x.M<I3>();\n }\n}\n\nclass C5<T5> where T5 : I3\n{\n void Test(C5<I3> y)\n {\n }\n}\n\nclass C6\n{\n void M<T6>() where T6 : I3 {}\n\n void Test(C6 x)\n {\n x.M<I3>();\n }\n}\n\nclass C7<T7> where T7 : I1\n{\n void Test(C7<I1> y)\n {\n }\n}\n\nclass C8\n{\n void M<T8>() where T8 : I1 {}\n\n void Test(C8 x)\n {\n x.M<I1>();\n }\n}\n\";\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n var expected = new[] {\n // (4,22): error CS8920: The interface 'I2' cannot be used as type parameter 'T1' in the generic type or method 'C1<T1>'. The constraint interface 'I1' or its base interface has static abstract members.\n // void Test(C1<I2> x)\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"x\").WithArguments(\"C1<T1>\", \"I1\", \"T1\", \"I2\").WithLocation(4, 22),\n // (15,11): error CS8920: The interface 'I2' cannot be used as type parameter 'T2' in the generic type or method 'C2.M<T2>()'. The constraint interface 'I1' or its base interface has static abstract members.\n // x.M<I2>();\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"M<I2>\").WithArguments(\"C2.M<T2>()\", \"I1\", \"T2\", \"I2\").WithLocation(15, 11),\n // (21,22): error CS8920: The interface 'I2' cannot be used as type parameter 'T3' in the generic type or method 'C3<T3>'. The constraint interface 'I2' or its base interface has static abstract members.\n // void Test(C3<I2> x, C3<I3> y)\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"x\").WithArguments(\"C3<T3>\", \"I2\", \"T3\", \"I2\").WithLocation(21, 22),\n // (21,32): error CS8920: The interface 'I3' cannot be used as type parameter 'T3' in the generic type or method 'C3<T3>'. The constraint interface 'I2' or its base interface has static abstract members.\n // void Test(C3<I2> x, C3<I3> y)\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"y\").WithArguments(\"C3<T3>\", \"I2\", \"T3\", \"I3\").WithLocation(21, 32),\n // (32,11): error CS8920: The interface 'I2' cannot be used as type parameter 'T4' in the generic type or method 'C4.M<T4>()'. The constraint interface 'I2' or its base interface has static abstract members.\n // x.M<I2>();\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"M<I2>\").WithArguments(\"C4.M<T4>()\", \"I2\", \"T4\", \"I2\").WithLocation(32, 11),\n // (33,11): error CS8920: The interface 'I3' cannot be used as type parameter 'T4' in the generic type or method 'C4.M<T4>()'. The constraint interface 'I2' or its base interface has static abstract members.\n // x.M<I3>();\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"M<I3>\").WithArguments(\"C4.M<T4>()\", \"I2\", \"T4\", \"I3\").WithLocation(33, 11),\n // (39,22): error CS8920: The interface 'I3' cannot be used as type parameter 'T5' in the generic type or method 'C5<T5>'. The constraint interface 'I3' or its base interface has static abstract members.\n // void Test(C5<I3> y)\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"y\").WithArguments(\"C5<T5>\", \"I3\", \"T5\", \"I3\").WithLocation(39, 22),\n // (50,11): error CS8920: The interface 'I3' cannot be used as type parameter 'T6' in the generic type or method 'C6.M<T6>()'. The constraint interface 'I3' or its base interface has static abstract members.\n // x.M<I3>();\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"M<I3>\").WithArguments(\"C6.M<T6>()\", \"I3\", \"T6\", \"I3\").WithLocation(50, 11),\n // (56,22): error CS8920: The interface 'I1' cannot be used as type parameter 'T7' in the generic type or method 'C7<T7>'. The constraint interface 'I1' or its base interface has static abstract members.\n // void Test(C7<I1> y)\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"y\").WithArguments(\"C7<T7>\", \"I1\", \"T7\", \"I1\").WithLocation(56, 22),\n // (67,11): error CS8920: The interface 'I1' cannot be used as type parameter 'T8' in the generic type or method 'C8.M<T8>()'. The constraint interface 'I1' or its base interface has static abstract members.\n // x.M<I1>();\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedInterfaceWithStaticAbstractMembers, \"M<I1>\").WithArguments(\"C8.M<T8>()\", \"I1\", \"T8\", \"I1\").WithLocation(67, 11)\n };\n\n compilation2.VerifyDiagnostics(expected);\n\n compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.EmitToImageReference() });\n\n compilation2.VerifyDiagnostics(expected);\n }\n\n [Fact]\n public void ConstraintChecks_02()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\npublic class C : I1\n{\n public static void M01() {}\n}\n\npublic struct S : I1\n{\n public static void M01() {}\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var source2 =\n@\"\nclass C1<T1> where T1 : I1\n{\n void Test(C1<C> x, C1<S> y, C1<T1> z)\n {\n }\n}\n\nclass C2\n{\n public void M<T2>(C2 x) where T2 : I1\n {\n x.M<T2>(x);\n }\n\n void Test(C2 x)\n {\n x.M<C>(x);\n x.M<S>(x);\n }\n}\n\nclass C3<T3> where T3 : I1\n{\n void Test(C1<T3> z)\n {\n }\n}\n\nclass C4\n{\n void M<T4>(C2 x) where T4 : I1\n {\n x.M<T4>(x);\n }\n}\n\nclass C5<T5>\n{\n internal virtual void M<U5>() where U5 : T5 { }\n}\n\nclass C6 : C5<I1>\n{\n internal override void M<U6>() { base.M<U6>(); }\n}\n\";\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyEmitDiagnostics();\n\n compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.EmitToImageReference() });\n\n compilation2.VerifyEmitDiagnostics();\n }\n\n [Fact]\n public void VarianceSafety_01()\n {\n var source1 =\n@\"\ninterface I2<out T1, in T2>\n{\n abstract static T1 P1 { get; }\n abstract static T2 P2 { get; }\n abstract static T1 P3 { set; }\n abstract static T2 P4 { set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (5,21): error CS1961: Invalid variance: The type parameter 'T2' must be covariantly valid on 'I2<T1, T2>.P2'. 'T2' is contravariant.\n // abstract static T2 P2 { get; }\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"T2\").WithArguments(\"I2<T1, T2>.P2\", \"T2\", \"contravariant\", \"covariantly\").WithLocation(5, 21),\n // (6,21): error CS1961: Invalid variance: The type parameter 'T1' must be contravariantly valid on 'I2<T1, T2>.P3'. 'T1' is covariant.\n // abstract static T1 P3 { set; }\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"T1\").WithArguments(\"I2<T1, T2>.P3\", \"T1\", \"covariant\", \"contravariantly\").WithLocation(6, 21)\n );\n }\n\n [Fact]\n public void VarianceSafety_02()\n {\n var source1 =\n@\"\ninterface I2<out T1, in T2>\n{\n abstract static T1 M1();\n abstract static T2 M2();\n abstract static void M3(T1 x);\n abstract static void M4(T2 x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (5,21): error CS1961: Invalid variance: The type parameter 'T2' must be covariantly valid on 'I2<T1, T2>.M2()'. 'T2' is contravariant.\n // abstract static T2 M2();\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"T2\").WithArguments(\"I2<T1, T2>.M2()\", \"T2\", \"contravariant\", \"covariantly\").WithLocation(5, 21),\n // (6,29): error CS1961: Invalid variance: The type parameter 'T1' must be contravariantly valid on 'I2<T1, T2>.M3(T1)'. 'T1' is covariant.\n // abstract static void M3(T1 x);\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"T1\").WithArguments(\"I2<T1, T2>.M3(T1)\", \"T1\", \"covariant\", \"contravariantly\").WithLocation(6, 29)\n );\n }\n\n [Fact]\n public void VarianceSafety_03()\n {\n var source1 =\n@\"\ninterface I2<out T1, in T2>\n{\n abstract static event System.Action<System.Func<T1>> E1;\n abstract static event System.Action<System.Func<T2>> E2;\n abstract static event System.Action<System.Action<T1>> E3;\n abstract static event System.Action<System.Action<T2>> E4;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (5,58): error CS1961: Invalid variance: The type parameter 'T2' must be covariantly valid on 'I2<T1, T2>.E2'. 'T2' is contravariant.\n // abstract static event System.Action<System.Func<T2>> E2;\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"E2\").WithArguments(\"I2<T1, T2>.E2\", \"T2\", \"contravariant\", \"covariantly\").WithLocation(5, 58),\n // (6,60): error CS1961: Invalid variance: The type parameter 'T1' must be contravariantly valid on 'I2<T1, T2>.E3'. 'T1' is covariant.\n // abstract static event System.Action<System.Action<T1>> E3;\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"E3\").WithArguments(\"I2<T1, T2>.E3\", \"T1\", \"covariant\", \"contravariantly\").WithLocation(6, 60)\n );\n }\n\n [Fact]\n public void VarianceSafety_04()\n {\n var source1 =\n@\"\ninterface I2<out T2>\n{\n abstract static int operator +(I2<T2> x);\n}\n\ninterface I3<out T3>\n{\n abstract static int operator +(I3<T3> x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (4,36): error CS1961: Invalid variance: The type parameter 'T2' must be contravariantly valid on 'I2<T2>.operator +(I2<T2>)'. 'T2' is covariant.\n // abstract static int operator +(I2<T2> x);\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"I2<T2>\").WithArguments(\"I2<T2>.operator +(I2<T2>)\", \"T2\", \"covariant\", \"contravariantly\").WithLocation(4, 36),\n // (9,36): error CS1961: Invalid variance: The type parameter 'T3' must be contravariantly valid on 'I3<T3>.operator +(I3<T3>)'. 'T3' is covariant.\n // abstract static int operator +(I3<T3> x);\n Diagnostic(ErrorCode.ERR_UnexpectedVariance, \"I3<T3>\").WithArguments(\"I3<T3>.operator +(I3<T3>)\", \"T3\", \"covariant\", \"contravariantly\").WithLocation(9, 36)\n );\n }\n\n [Theory]\n [InlineData(\"+\")]\n [InlineData(\"-\")]\n [InlineData(\"!\")]\n [InlineData(\"~\")]\n [InlineData(\"true\")]\n [InlineData(\"false\")]\n public void OperatorSignature_01(string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static bool operator \" + op + @\"(T1 x) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static bool operator \" + op + @\"(T2? x) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract bool operator \" + op + @\"(T3 x);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract bool operator \" + op + @\"(T4? x);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract bool operator \" + op + @\"(T5 x);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract bool operator \" + op + @\"(T71 x);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract bool operator \" + op + @\"(T8 x);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract bool operator \" + op + @\"(T10 x);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract bool operator \" + op + @\"(int x);\n}\n\ninterface I13\n{\n static abstract bool operator \" + op + @\"(I13 x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (4,26): error CS0562: The parameter of a unary operator must be the containing type\n // static bool operator +(T1 x) => throw null;\n Diagnostic(ErrorCode.ERR_BadUnaryOperatorSignature, op).WithLocation(4, 26),\n // (9,26): error CS0562: The parameter of a unary operator must be the containing type\n // static bool operator +(T2? x) => throw null;\n Diagnostic(ErrorCode.ERR_BadUnaryOperatorSignature, op).WithLocation(9, 26),\n // (26,39): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T5 x);\n Diagnostic(ErrorCode.ERR_BadAbstractUnaryOperatorSignature, op).WithLocation(26, 39),\n // (32,35): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T71 x);\n Diagnostic(ErrorCode.ERR_BadAbstractUnaryOperatorSignature, op).WithLocation(32, 35),\n // (37,35): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T8 x);\n Diagnostic(ErrorCode.ERR_BadAbstractUnaryOperatorSignature, op).WithLocation(37, 35),\n // (44,35): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T10 x);\n Diagnostic(ErrorCode.ERR_BadAbstractUnaryOperatorSignature, op).WithLocation(44, 35),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator false(T11)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(T11)\").WithLocation(47, 18),\n // (51,35): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator false(int x);\n Diagnostic(ErrorCode.ERR_BadAbstractUnaryOperatorSignature, op).WithLocation(51, 35)\n );\n }\n\n [Theory]\n [InlineData(\"++\")]\n [InlineData(\"--\")]\n public void OperatorSignature_02(string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static T1 operator \" + op + @\"(T1 x) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static T2? operator \" + op + @\"(T2? x) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract T3 operator \" + op + @\"(T3 x);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract T4? operator \" + op + @\"(T4? x);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract T5 operator \" + op + @\"(T5 x);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract T71 operator \" + op + @\"(T71 x);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract T8 operator \" + op + @\"(T8 x);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract T10 operator \" + op + @\"(T10 x);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract int operator \" + op + @\"(int x);\n}\n\ninterface I13\n{\n static abstract I13 operator \" + op + @\"(I13 x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (4,24): error CS0559: The parameter type for ++ or -- operator must be the containing type\n // static T1 operator ++(T1 x) => throw null;\n Diagnostic(ErrorCode.ERR_BadIncDecSignature, op).WithLocation(4, 24),\n // (9,25): error CS0559: The parameter type for ++ or -- operator must be the containing type\n // static T2? operator ++(T2? x) => throw null;\n Diagnostic(ErrorCode.ERR_BadIncDecSignature, op).WithLocation(9, 25),\n // (26,37): error CS8922: The parameter type for ++ or -- operator must be the containing type, or its type parameter constrained to it.\n // static abstract T5 operator ++(T5 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecSignature, op).WithLocation(26, 37),\n // (32,34): error CS8922: The parameter type for ++ or -- operator must be the containing type, or its type parameter constrained to it.\n // static abstract T71 operator ++(T71 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecSignature, op).WithLocation(32, 34),\n // (37,33): error CS8922: The parameter type for ++ or -- operator must be the containing type, or its type parameter constrained to it.\n // static abstract T8 operator ++(T8 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecSignature, op).WithLocation(37, 33),\n // (44,34): error CS8922: The parameter type for ++ or -- operator must be the containing type, or its type parameter constrained to it.\n // static abstract T10 operator ++(T10 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecSignature, op).WithLocation(44, 34),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator --(T11)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(T11)\").WithLocation(47, 18),\n // (51,34): error CS8922: The parameter type for ++ or -- operator must be the containing type, or its type parameter constrained to it.\n // static abstract int operator ++(int x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecSignature, op).WithLocation(51, 34)\n );\n }\n\n [Theory]\n [InlineData(\"++\")]\n [InlineData(\"--\")]\n public void OperatorSignature_03(string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static T1 operator \" + op + @\"(I1<T1> x) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static T2? operator \" + op + @\"(I2<T2> x) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract T3 operator \" + op + @\"(I3<T3> x);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract T4? operator \" + op + @\"(I4<T4> x);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract T5 operator \" + op + @\"(I6 x);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract T71 operator \" + op + @\"(I7<T71, T72> x);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract T8 operator \" + op + @\"(I8<T8> x);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract T10 operator \" + op + @\"(I10<T10> x);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract int operator \" + op + @\"(I12 x);\n}\n\ninterface I13<T13> where T13 : struct, I13<T13>\n{\n static abstract T13? operator \" + op + @\"(T13 x);\n}\n\ninterface I14<T14> where T14 : struct, I14<T14>\n{\n static abstract T14 operator \" + op + @\"(T14? x);\n}\n\ninterface I15<T151, T152> where T151 : I15<T151, T152> where T152 : I15<T151, T152>\n{\n static abstract T151 operator \" + op + @\"(T152 x);\n}\n\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (4,24): error CS0448: The return type for ++ or -- operator must match the parameter type or be derived from the parameter type\n // static T1 operator ++(I1<T1> x) => throw null;\n Diagnostic(ErrorCode.ERR_BadIncDecRetType, op).WithLocation(4, 24),\n // (9,25): error CS0448: The return type for ++ or -- operator must match the parameter type or be derived from the parameter type\n // static T2? operator ++(I2<T2> x) => throw null;\n Diagnostic(ErrorCode.ERR_BadIncDecRetType, op).WithLocation(9, 25),\n // (19,34): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T4? operator ++(I4<T4> x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(19, 34),\n // (26,37): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T5 operator ++(I6 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(26, 37),\n // (32,34): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T71 operator ++(I7<T71, T72> x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(32, 34),\n // (37,33): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T8 operator ++(I8<T8> x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(37, 33),\n // (44,34): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T10 operator ++(I10<T10> x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(44, 34),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator ++(I10<T11>)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(I10<T11>)\").WithLocation(47, 18),\n // (51,34): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract int operator ++(I12 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(51, 34),\n // (56,35): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T13? operator ++(T13 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(56, 35),\n // (61,34): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T14 operator ++(T14? x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(61, 34),\n // (66,35): error CS8923: The return type for ++ or -- operator must either match the parameter type, or be derived from the parameter type, or be the containing type's type parameter constrained to it unless the parameter type is a different type parameter.\n // static abstract T151 operator ++(T152 x);\n Diagnostic(ErrorCode.ERR_BadAbstractIncDecRetType, op).WithLocation(66, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void OperatorSignature_04([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static bool operator \" + op + @\"(T1 x, bool y) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static bool operator \" + op + @\"(T2? x, bool y) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract bool operator \" + op + @\"(T3 x, bool y);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract bool operator \" + op + @\"(T4? x, bool y);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract bool operator \" + op + @\"(T5 x, bool y);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract bool operator \" + op + @\"(T71 x, bool y);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract bool operator \" + op + @\"(T8 x, bool y);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract bool operator \" + op + @\"(T10 x, bool y);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract bool operator \" + op + @\"(int x, bool y);\n}\n\ninterface I13\n{\n static abstract bool operator \" + op + @\"(I13 x, bool y);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators)).Verify(\n // (4,26): error CS0563: One of the parameters of a binary operator must be the containing type\n // static bool operator +(T1 x, bool y) => throw null;\n Diagnostic(ErrorCode.ERR_BadBinaryOperatorSignature, op).WithLocation(4, 26),\n // (9,26): error CS0563: One of the parameters of a binary operator must be the containing type\n // static bool operator +(T2? x, bool y) => throw null;\n Diagnostic(ErrorCode.ERR_BadBinaryOperatorSignature, op).WithLocation(9, 26),\n // (26,39): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T5 x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(26, 39),\n // (32,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T71 x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(32, 35),\n // (37,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T8 x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(37, 35),\n // (44,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(T10 x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(44, 35),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator /(T11, bool)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(T11, bool)\").WithLocation(47, 18),\n // (51,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(int x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(51, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void OperatorSignature_05([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static bool operator \" + op + @\"(bool y, T1 x) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static bool operator \" + op + @\"(bool y, T2? x) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract bool operator \" + op + @\"(bool y, T3 x);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract bool operator \" + op + @\"(bool y, T4? x);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract bool operator \" + op + @\"(bool y, T5 x);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract bool operator \" + op + @\"(bool y, T71 x);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract bool operator \" + op + @\"(bool y, T8 x);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract bool operator \" + op + @\"(bool y, T10 x);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract bool operator \" + op + @\"(bool y, int x);\n}\n\ninterface I13\n{\n static abstract bool operator \" + op + @\"(bool y, I13 x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators)).Verify(\n // (4,26): error CS0563: One of the parameters of a binary operator must be the containing type\n // static bool operator +(bool y, T1 x) => throw null;\n Diagnostic(ErrorCode.ERR_BadBinaryOperatorSignature, op).WithLocation(4, 26),\n // (9,26): error CS0563: One of the parameters of a binary operator must be the containing type\n // static bool operator +(bool y, T2? x) => throw null;\n Diagnostic(ErrorCode.ERR_BadBinaryOperatorSignature, op).WithLocation(9, 26),\n // (26,39): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(bool y, T5 x);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(26, 39),\n // (32,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(bool y, T71 x);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(32, 35),\n // (37,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(bool y, T8 x);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(37, 35),\n // (44,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(bool y, T10 x);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(44, 35),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator <=(bool, T11)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(bool, T11)\").WithLocation(47, 18),\n // (51,35): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // static abstract bool operator +(bool y, int x);\n Diagnostic(ErrorCode.ERR_BadAbstractBinaryOperatorSignature, op).WithLocation(51, 35)\n );\n }\n\n [Theory]\n [InlineData(\"<<\")]\n [InlineData(\">>\")]\n public void OperatorSignature_06(string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n static bool operator \" + op + @\"(T1 x, int y) => throw null;\n}\n\ninterface I2<T2> where T2 : struct, I2<T2>\n{\n static bool operator \" + op + @\"(T2? x, int y) => throw null;\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract bool operator \" + op + @\"(T3 x, int y);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract bool operator \" + op + @\"(T4? x, int y);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract bool operator \" + op + @\"(T5 x, int y);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract bool operator \" + op + @\"(T71 x, int y);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract bool operator \" + op + @\"(T8 x, int y);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract bool operator \" + op + @\"(T10 x, int y);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract bool operator \" + op + @\"(int x, int y);\n}\n\ninterface I13\n{\n static abstract bool operator \" + op + @\"(I13 x, int y);\n}\n\ninterface I14\n{\n static abstract bool operator \" + op + @\"(I14 x, bool y);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (4,26): error CS0564: The first operand of an overloaded shift operator must have the same type as the containing type, and the type of the second operand must be int\n // static bool operator <<(T1 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_BadShiftOperatorSignature, op).WithLocation(4, 26),\n // (9,26): error CS0564: The first operand of an overloaded shift operator must have the same type as the containing type, and the type of the second operand must be int\n // static bool operator <<(T2? x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_BadShiftOperatorSignature, op).WithLocation(9, 26),\n // (26,39): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(T5 x, int y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(26, 39),\n // (32,35): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(T71 x, int y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(32, 35),\n // (37,35): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(T8 x, int y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(37, 35),\n // (44,35): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(T10 x, int y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(44, 35),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.operator >>(T11, int)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.operator \" + op + \"(T11, int)\").WithLocation(47, 18),\n // (51,35): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(int x, int y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(51, 35),\n // (61,35): error CS8925: The first operand of an overloaded shift operator must have the same type as the containing type or its type parameter constrained to it, and the type of the second operand must be int\n // static abstract bool operator <<(I14 x, bool y);\n Diagnostic(ErrorCode.ERR_BadAbstractShiftOperatorSignature, op).WithLocation(61, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void OperatorSignature_07([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n abstract static \" + op + @\" operator T1(T1 y);\n}\n\ninterface I2<T2> where T2 : I2<T2>\n{\n abstract static \" + op + @\" operator dynamic(T2 y);\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract \" + op + @\" operator T3(bool y);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract \" + op + @\" operator T4?(bool y);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract \" + op + @\" operator T5 (bool y);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract \" + op + @\" operator T71 (bool y);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract \" + op + @\" operator T8(bool y);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract \" + op + @\" operator T10(bool y);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract \" + op + @\" operator int(bool y);\n}\n\ninterface I13\n{\n static abstract \" + op + @\" operator I13(bool y);\n}\n\ninterface I14<T14> where T14 : I14<T14>\n{\n abstract static \" + op + @\" operator object(T14 y);\n}\n\nclass C15 {}\nclass C16 : C15 {}\n\ninterface I17<T17> where T17 : C15, I17<T17>\n{\n abstract static \" + op + @\" operator C16(T17 y);\n}\n\ninterface I18<T18> where T18 : C16, I18<T18>\n{\n abstract static \" + op + @\" operator C15(T18 y);\n}\n\ninterface I19<T19_1, T19_2> where T19_1 : I19<T19_1, T19_2>, T19_2\n{\n abstract static \" + op + @\" operator T19_1(T19_2 y);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (4,39): error CS0555: User-defined operator cannot convert a type to itself\n // abstract static explicit operator T1(T1 y);\n Diagnostic(ErrorCode.ERR_IdentityConversion, \"T1\").WithLocation(4, 39),\n // (9,39): error CS1964: 'I2<T2>.explicit operator dynamic(T2)': user-defined conversions to or from the dynamic type are not allowed\n // abstract static explicit operator dynamic(T2 y);\n Diagnostic(ErrorCode.ERR_BadDynamicConversion, \"dynamic\").WithArguments(\"I2<T2>.\" + op + \" operator dynamic(T2)\").WithLocation(9, 39),\n // (26,43): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator T5 (bool y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"T5\").WithLocation(26, 43),\n // (32,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator T71 (bool y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"T71\").WithLocation(32, 39),\n // (37,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator T8(bool y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"T8\").WithLocation(37, 39),\n // (44,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator T10(bool y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"T10\").WithLocation(44, 39),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.explicit operator T11(bool)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.\" + op + \" operator T11(bool)\").WithLocation(47, 18),\n // (51,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator int(bool y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"int\").WithLocation(51, 39),\n // (56,39): error CS0552: 'I13.explicit operator I13(bool)': user-defined conversions to or from an interface are not allowed\n // static abstract explicit operator I13(bool y);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"I13\").WithArguments(\"I13.\" + op + \" operator I13(bool)\").WithLocation(56, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void OperatorSignature_08([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n var source1 =\n@\"\ninterface I1<T1> where T1 : I1<T1>\n{\n abstract static \" + op + @\" operator T1(T1 y);\n}\n\ninterface I2<T2> where T2 : I2<T2>\n{\n abstract static \" + op + @\" operator T2(dynamic y);\n}\n\ninterface I3<T3> where T3 : I3<T3>\n{\n static abstract \" + op + @\" operator bool(T3 y);\n}\n\ninterface I4<T4> where T4 : struct, I4<T4>\n{\n static abstract \" + op + @\" operator bool(T4? y);\n}\n\nclass C5<T5> where T5 : C5<T5>.I6\n{\n public interface I6\n {\n static abstract \" + op + @\" operator bool(T5 y);\n }\n}\n\ninterface I7<T71, T72> where T72 : I7<T71, T72> where T71 : T72\n{\n static abstract \" + op + @\" operator bool(T71 y);\n}\n\ninterface I8<T8> where T8 : I9<T8>\n{\n static abstract \" + op + @\" operator bool(T8 y);\n}\n\ninterface I9<T9> : I8<T9> where T9 : I9<T9> {}\n\ninterface I10<T10> where T10 : C11<T10>\n{\n static abstract \" + op + @\" operator bool(T10 y);\n}\n\nclass C11<T11> : I10<T11> where T11 : C11<T11> {}\n\ninterface I12\n{\n static abstract \" + op + @\" operator bool(int y);\n}\n\ninterface I13\n{\n static abstract \" + op + @\" operator bool(I13 y);\n}\n\ninterface I14<T14> where T14 : I14<T14>\n{\n abstract static \" + op + @\" operator T14(object y);\n}\n\nclass C15 {}\nclass C16 : C15 {}\n\ninterface I17<T17> where T17 : C15, I17<T17>\n{\n abstract static \" + op + @\" operator T17(C16 y);\n}\n\ninterface I18<T18> where T18 : C16, I18<T18>\n{\n abstract static \" + op + @\" operator T18(C15 y);\n}\n\ninterface I19<T19_1, T19_2> where T19_1 : I19<T19_1, T19_2>, T19_2\n{\n abstract static \" + op + @\" operator T19_2(T19_1 y);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (4,39): error CS0555: User-defined operator cannot convert a type to itself\n // abstract static explicit operator T1(T1 y);\n Diagnostic(ErrorCode.ERR_IdentityConversion, \"T1\").WithLocation(4, 39),\n // (9,39): error CS1964: 'I2<T2>.explicit operator T2(dynamic)': user-defined conversions to or from the dynamic type are not allowed\n // abstract static explicit operator T2(dynamic y);\n Diagnostic(ErrorCode.ERR_BadDynamicConversion, \"T2\").WithArguments(\"I2<T2>.\" + op + \" operator T2(dynamic)\").WithLocation(9, 39),\n // (26,43): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator bool(T5 y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"bool\").WithLocation(26, 43),\n // (32,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator bool(T71 y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"bool\").WithLocation(32, 39),\n // (37,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator bool(T8 y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"bool\").WithLocation(37, 39),\n // (44,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator bool(T10 y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"bool\").WithLocation(44, 39),\n // (47,18): error CS0535: 'C11<T11>' does not implement interface member 'I10<T11>.explicit operator bool(T11)'\n // class C11<T11> : I10<T11> where T11 : C11<T11> {}\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I10<T11>\").WithArguments(\"C11<T11>\", \"I10<T11>.\" + op + \" operator bool(T11)\").WithLocation(47, 18),\n // (51,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // static abstract explicit operator bool(int y);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"bool\").WithLocation(51, 39),\n // (56,39): error CS0552: 'I13.explicit operator bool(I13)': user-defined conversions to or from an interface are not allowed\n // static abstract explicit operator bool(I13 y);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"bool\").WithArguments(\"I13.\" + op + \" operator bool(I13)\").WithLocation(56, 39)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n\n static void M02()\n {\n M01();\n M04();\n }\n\n void M03()\n {\n this.M01();\n this.M04();\n }\n\n static void M04() {}\n\n protected abstract static void M05();\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n I1.M01();\n x.M01();\n I1.M04();\n x.M04();\n }\n\n static void MT2<T>() where T : I1\n {\n T.M03();\n T.M04();\n T.M00();\n T.M05();\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.M01());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // M01();\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"M01\").WithLocation(8, 9),\n // (14,9): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.M01();\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M01\").WithArguments(\"I1.M01()\").WithLocation(14, 9),\n // (15,9): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.M04();\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M04\").WithArguments(\"I1.M04()\").WithLocation(15, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.M01();\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.M01\").WithLocation(27, 9),\n // (28,9): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.M01();\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M01\").WithArguments(\"I1.M01()\").WithLocation(28, 9),\n // (30,9): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.M04();\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M04\").WithArguments(\"I1.M04()\").WithLocation(30, 9),\n // (35,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.M03();\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 9),\n // (36,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.M04();\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 9),\n // (37,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.M00();\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 9),\n // (38,11): error CS0122: 'I1.M05()' is inaccessible due to its protection level\n // T.M05();\n Diagnostic(ErrorCode.ERR_BadAccess, \"M05\").WithArguments(\"I1.M05()\").WithLocation(38, 11),\n // (40,71): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.M01());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.M01()\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n\n static void M02()\n {\n _ = nameof(M01);\n _ = nameof(M04);\n }\n\n void M03()\n {\n _ = nameof(this.M01);\n _ = nameof(this.M04);\n }\n\n static void M04() {}\n\n protected abstract static void M05();\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = nameof(I1.M01);\n _ = nameof(x.M01);\n _ = nameof(I1.M04);\n _ = nameof(x.M04);\n }\n\n static void MT2<T>() where T : I1\n {\n _ = nameof(T.M03);\n _ = nameof(T.M04);\n _ = nameof(T.M00);\n _ = nameof(T.M05);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (35,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.M03);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 20),\n // (36,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.M04);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 20),\n // (37,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.M00);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 20),\n // (38,22): error CS0122: 'I1.M05()' is inaccessible due to its protection level\n // _ = nameof(T.M05);\n Diagnostic(ErrorCode.ERR_BadAccess, \"M05\").WithArguments(\"I1.M05()\").WithLocation(38, 22)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n abstract static void M04(int x);\n}\n\nclass Test\n{\n static void M02<T, U>() where T : U where U : I1\n {\n T.M01();\n }\n\n static string M03<T, U>() where T : U where U : I1\n {\n return nameof(T.M01);\n }\n\n static async void M05<T, U>() where T : U where U : I1\n {\n T.M04(await System.Threading.Tasks.Task.FromResult(1));\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 14 (0xe)\n .maxstack 0\n IL_0000: nop\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"void I1.M01()\"\"\n IL_000c: nop\n IL_000d: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 11 (0xb)\n .maxstack 1\n .locals init (string V_0)\n IL_0000: nop\n IL_0001: ldstr \"\"M01\"\"\n IL_0006: stloc.0\n IL_0007: br.s IL_0009\n IL_0009: ldloc.0\n IL_000a: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 12 (0xc)\n .maxstack 0\n IL_0000: constrained. \"\"T\"\"\n IL_0006: call \"\"void I1.M01()\"\"\n IL_000b: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 1\n IL_0000: ldstr \"\"M01\"\"\n IL_0005: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<InvocationExpressionSyntax>().First();\n\n Assert.Equal(\"T.M01()\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIInvocationOperation (virtual void I1.M01()) (OperationKind.Invocation, Type: System.Void) (Syntax: 'T.M01()')\n Instance Receiver: \n null\n Arguments(0)\n\");\n\n var m02 = compilation1.GetMember<MethodSymbol>(\"Test.M02\");\n\n Assert.Equal(\"void I1.M01()\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0], \"M01\").Single().ToTestDisplayString());\n Assert.Contains(\"void I1.M01()\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n Assert.Equal(\"void I1.M01()\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0], \"M01\").Single().ToTestDisplayString());\n Assert.Contains(\"void I1.M01()\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n\n Assert.Equal(\"void I1.M01()\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"M01\").Single().ToTestDisplayString());\n Assert.Contains(\"void I1.M01()\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n Assert.Equal(\"void I1.M01()\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"M01\").Single().ToTestDisplayString());\n Assert.Contains(\"void I1.M01()\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n\n Assert.Contains(\"M01\", model.LookupNames(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()));\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.M01();\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.M01\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_05()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 Select(System.Func<int, int> p);\n}\n\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = from t in T select t + 1;\n _ = from t in I1 select t + 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n // https://github.com/dotnet/roslyn/issues/53796: Confirm whether we want to enable the 'from t in T' scenario.\n compilation1.VerifyDiagnostics(\n // (11,23): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = from t in T select t + 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(11, 23),\n // (12,26): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = from t in I1 select t + 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"select t + 1\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.M01();\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.M01();\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.M01();\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9),\n // (12,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 26)\n );\n }\n\n [Theory]\n [InlineData(\"+\", \"\")]\n [InlineData(\"-\", \"\")]\n [InlineData(\"!\", \"\")]\n [InlineData(\"~\", \"\")]\n [InlineData(\"++\", \"\")]\n [InlineData(\"--\", \"\")]\n [InlineData(\"\", \"++\")]\n [InlineData(\"\", \"--\")]\n public void ConsumeAbstractUnaryOperator_01(string prefixOp, string postfixOp)\n {\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static T operator\" + prefixOp + postfixOp + @\" (T x);\n abstract static I1<T> operator\" + prefixOp + postfixOp + @\" (I1<T> x);\n static void M02(I1<T> x)\n {\n _ = \" + prefixOp + \"x\" + postfixOp + @\";\n }\n\n void M03(I1<T> y)\n {\n _ = \" + prefixOp + \"y\" + postfixOp + @\";\n }\n}\n\nclass Test<T> where T : I1<T>\n{\n static void MT1(I1<T> a)\n {\n _ = \" + prefixOp + \"a\" + postfixOp + @\";\n }\n\n static void MT2()\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (\" + prefixOp + \"b\" + postfixOp + @\").ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = -x;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, prefixOp + \"x\" + postfixOp).WithLocation(8, 13),\n // (13,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = -y;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, prefixOp + \"y\" + postfixOp).WithLocation(13, 13),\n // (21,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = -a;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, prefixOp + \"a\" + postfixOp).WithLocation(21, 13),\n (prefixOp + postfixOp).Length == 1 ?\n // (26,78): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (-b).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, prefixOp + \"b\" + postfixOp).WithLocation(26, 78)\n :\n // (26,78): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b--).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, prefixOp + \"b\" + postfixOp).WithLocation(26, 78)\n );\n }\n\n [Theory]\n [InlineData(\"+\", \"\", \"op_UnaryPlus\", \"Plus\")]\n [InlineData(\"-\", \"\", \"op_UnaryNegation\", \"Minus\")]\n [InlineData(\"!\", \"\", \"op_LogicalNot\", \"Not\")]\n [InlineData(\"~\", \"\", \"op_OnesComplement\", \"BitwiseNegation\")]\n [InlineData(\"++\", \"\", \"op_Increment\", \"Increment\")]\n [InlineData(\"--\", \"\", \"op_Decrement\", \"Decrement\")]\n [InlineData(\"\", \"++\", \"op_Increment\", \"Increment\")]\n [InlineData(\"\", \"--\", \"op_Decrement\", \"Decrement\")]\n public void ConsumeAbstractUnaryOperator_03(string prefixOp, string postfixOp, string metadataName, string opKind)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator\" + prefixOp + postfixOp + @\" (T x);\n}\n\nclass Test\n{\n static T M02<T, U>(T x) where T : U where U : I1<T>\n {\n return \" + prefixOp + \"x\" + postfixOp + @\";\n }\n\n static T? M03<T, U>(T? y) where T : struct, U where U : I1<T>\n {\n return \" + prefixOp + \"y\" + postfixOp + @\";\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n switch ((prefixOp, postfixOp))\n {\n case (\"++\", \"\"):\n case (\"--\", \"\"):\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 21 (0x15)\n .maxstack 2\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: dup\n IL_000e: starg.s V_0\n IL_0010: stloc.0\n IL_0011: br.s IL_0013\n IL_0013: ldloc.0\n IL_0014: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 54 (0x36)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1,\n T? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"T?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002e\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0029: newobj \"\"T?..ctor(T)\"\"\n IL_002e: dup\n IL_002f: starg.s V_0\n IL_0031: stloc.2\n IL_0032: br.s IL_0034\n IL_0034: ldloc.2\n IL_0035: ret\n}\n\");\n break;\n\n case (\"\", \"++\"):\n case (\"\", \"--\"):\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 21 (0x15)\n .maxstack 2\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: dup\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000e: starg.s V_0\n IL_0010: stloc.0\n IL_0011: br.s IL_0013\n IL_0013: ldloc.0\n IL_0014: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 54 (0x36)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1,\n T? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: dup\n IL_0003: stloc.0\n IL_0004: ldloca.s V_0\n IL_0006: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000b: brtrue.s IL_0018\n IL_000d: ldloca.s V_1\n IL_000f: initobj \"\"T?\"\"\n IL_0015: ldloc.1\n IL_0016: br.s IL_002f\n IL_0018: ldloca.s V_0\n IL_001a: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001f: constrained. \"\"T\"\"\n IL_0025: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_002a: newobj \"\"T?..ctor(T)\"\"\n IL_002f: starg.s V_0\n IL_0031: stloc.2\n IL_0032: br.s IL_0034\n IL_0034: ldloc.2\n IL_0035: ret\n}\n\");\n break;\n\n default:\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 1\n .locals init (T? V_0,\n T? V_1,\n T? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"T?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002e\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0029: newobj \"\"T?..ctor(T)\"\"\n IL_002e: stloc.2\n IL_002f: br.s IL_0031\n IL_0031: ldloc.2\n IL_0032: ret\n}\n\");\n break;\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n switch ((prefixOp, postfixOp))\n {\n case (\"++\", \"\"):\n case (\"--\", \"\"):\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000c: dup\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 49 (0x31)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brtrue.s IL_0016\n IL_000b: ldloca.s V_1\n IL_000d: initobj \"\"T?\"\"\n IL_0013: ldloc.1\n IL_0014: br.s IL_002d\n IL_0016: ldloca.s V_0\n IL_0018: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001d: constrained. \"\"T\"\"\n IL_0023: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0028: newobj \"\"T?..ctor(T)\"\"\n IL_002d: dup\n IL_002e: starg.s V_0\n IL_0030: ret\n}\n\");\n break;\n\n case (\"\", \"++\"):\n case (\"\", \"--\"):\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: dup\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 49 (0x31)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: dup\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"T?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002e\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0029: newobj \"\"T?..ctor(T)\"\"\n IL_002e: starg.s V_0\n IL_0030: ret\n}\n\");\n break;\n\n default:\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000c: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T?)\",\n@\"\n{\n // Code size 45 (0x2d)\n .maxstack 1\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brtrue.s IL_0015\n IL_000b: ldloca.s V_1\n IL_000d: initobj \"\"T?\"\"\n IL_0013: ldloc.1\n IL_0014: ret\n IL_0015: ldloca.s V_0\n IL_0017: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001c: constrained. \"\"T\"\"\n IL_0022: call \"\"T I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0027: newobj \"\"T?..ctor(T)\"\"\n IL_002c: ret\n}\n\");\n break;\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = postfixOp != \"\" ? (ExpressionSyntax)tree.GetRoot().DescendantNodes().OfType<PostfixUnaryExpressionSyntax>().First() : tree.GetRoot().DescendantNodes().OfType<PrefixUnaryExpressionSyntax>().First();\n\n Assert.Equal(prefixOp + \"x\" + postfixOp, node.ToString());\n\n switch ((prefixOp, postfixOp))\n {\n case (\"++\", \"\"):\n case (\"--\", \"\"):\n case (\"\", \"++\"):\n case (\"\", \"--\"):\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIIncrementOrDecrementOperation (\" + (prefixOp != \"\" ? \"Prefix\" : \"Postfix\") + @\") (OperatorMethod: T I1<T>.\" + metadataName + @\"(T x)) (OperationKind.\" + opKind + @\", Type: T) (Syntax: '\" + prefixOp + \"x\" + postfixOp + @\"')\n Target: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n\");\n break;\n\n default:\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIUnaryOperation (UnaryOperatorKind.\" + opKind + @\") (OperatorMethod: T I1<T>.\" + metadataName + @\"(T x)) (OperationKind.Unary, Type: T) (Syntax: '\" + prefixOp + \"x\" + postfixOp + @\"')\n Operand: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n\");\n break;\n }\n }\n\n [Theory]\n [InlineData(\"+\", \"\")]\n [InlineData(\"-\", \"\")]\n [InlineData(\"!\", \"\")]\n [InlineData(\"~\", \"\")]\n [InlineData(\"++\", \"\")]\n [InlineData(\"--\", \"\")]\n [InlineData(\"\", \"++\")]\n [InlineData(\"\", \"--\")]\n public void ConsumeAbstractUnaryOperator_04(string prefixOp, string postfixOp)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator\" + prefixOp + postfixOp + @\" (T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x) where T : I1<T>\n {\n _ = \" + prefixOp + \"x\" + postfixOp + @\";\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = -x;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, prefixOp + \"x\" + postfixOp).WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,32): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static T operator- (T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, prefixOp + postfixOp).WithLocation(12, 31)\n );\n }\n\n [Theory]\n [InlineData(\"+\", \"\")]\n [InlineData(\"-\", \"\")]\n [InlineData(\"!\", \"\")]\n [InlineData(\"~\", \"\")]\n [InlineData(\"++\", \"\")]\n [InlineData(\"--\", \"\")]\n [InlineData(\"\", \"++\")]\n [InlineData(\"\", \"--\")]\n public void ConsumeAbstractUnaryOperator_06(string prefixOp, string postfixOp)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator\" + prefixOp + postfixOp + @\" (T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x) where T : I1<T>\n {\n _ = \" + prefixOp + \"x\" + postfixOp + @\";\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = -x;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, prefixOp + \"x\" + postfixOp).WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static T operator- (T x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, prefixOp + postfixOp).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 31)\n );\n }\n\n [Fact]\n public void ConsumeAbstractTrueOperator_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n\n static void M02(I1 x)\n {\n _ = x ? true : false;\n }\n\n void M03(I1 y)\n {\n _ = y ? true : false;\n }\n}\n\nclass Test\n{\n static void MT1(I1 a)\n {\n _ = a ? true : false;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b ? true : false).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (9,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = x ? true : false;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x\").WithLocation(9, 13),\n // (14,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = y ? true : false;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y\").WithLocation(14, 13),\n // (22,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = a ? true : false;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a\").WithLocation(22, 13),\n // (27,78): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b ? true : false).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"b\").WithLocation(27, 78)\n );\n }\n\n [Fact]\n public void ConsumeAbstractTrueOperator_03()\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static bool operator true (T x);\n abstract static bool operator false (T x);\n}\n\nclass Test\n{\n static void M02<T, U>(T x) where T : U where U : I1<T>\n {\n _ = x ? true : false;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"bool I1<T>.op_True(T)\"\"\n IL_000d: brtrue.s IL_0011\n IL_000f: br.s IL_0011\n IL_0011: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 14 (0xe)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"bool I1<T>.op_True(T)\"\"\n IL_000c: pop\n IL_000d: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<ConditionalExpressionSyntax>().First();\n\n Assert.Equal(\"x ? true : false\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIConditionalOperation (OperationKind.Conditional, Type: System.Boolean) (Syntax: 'x ? true : false')\n Condition: \n IUnaryOperation (UnaryOperatorKind.True) (OperatorMethod: System.Boolean I1<T>.op_True(T x)) (OperationKind.Unary, Type: System.Boolean, IsImplicit) (Syntax: 'x')\n Operand: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n WhenTrue: \n ILiteralOperation (OperationKind.Literal, Type: System.Boolean, Constant: True) (Syntax: 'true')\n WhenFalse: \n ILiteralOperation (OperationKind.Literal, Type: System.Boolean, Constant: False) (Syntax: 'false')\n\");\n }\n\n [Fact]\n public void ConsumeAbstractTrueOperator_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x) where T : I1\n {\n _ = x ? true : false;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x ? true : false;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"true\").WithLocation(12, 35),\n // (13,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"false\").WithLocation(13, 35)\n );\n }\n\n [Fact]\n public void ConsumeAbstractTrueOperator_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x) where T : I1\n {\n _ = x ? true : false;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x ? true : false;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (12,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"true\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 35),\n // (13,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"false\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(13, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractTrueFalseOperatorForTupleEquality_01([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n\n static void M02((int, C<I1>) x)\n {\n _ = x \" + op + @\" x;\n }\n\n void M03((int, C<I1>) y)\n {\n _ = y \" + op + @\" y;\n }\n}\n\nclass Test\n{\n static void MT1((int, C<I1>) a)\n {\n _ = a \" + op + @\" a;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<(int, C<T>)>>)(((int, C<T>) b) => (b \" + op + @\" b).ToString());\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (9,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x \" + op + \" x\").WithLocation(9, 13),\n // (14,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = y == y;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y \" + op + \" y\").WithLocation(14, 13),\n // (22,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = a == a;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a \" + op + \" a\").WithLocation(22, 13),\n // (27,98): error CS8382: An expression tree may not contain a tuple == or != operator\n // _ = (System.Linq.Expressions.Expression<System.Action<(int, C<T>)>>)(((int, C<T>) b) => (b == b).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsTupleBinOp, \"b \" + op + \" b\").WithLocation(27, 98)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractTrueFalseOperatorForTupleEquality_03([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static bool operator true (T x);\n abstract static bool operator false (T x);\n}\n\nclass Test\n{\n static void M02<T, U>((int, C<T>) x) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 55 (0x37)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0011: bne.un.s IL_0034\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001f: call \"\"T C<T>.op_Equality(C<T>, C<T>)\"\"\n IL_0024: constrained. \"\"T\"\"\n IL_002a: call \"\"bool I1<T>.op_False(T)\"\"\n IL_002f: ldc.i4.0\n IL_0030: ceq\n IL_0032: br.s IL_0035\n IL_0034: ldc.i4.0\n IL_0035: pop\n IL_0036: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 52 (0x34)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0011: bne.un.s IL_0031\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001f: call \"\"T C<T>.op_Inequality(C<T>, C<T>)\"\"\n IL_0024: constrained. \"\"T\"\"\n IL_002a: call \"\"bool I1<T>.op_True(T)\"\"\n IL_002f: br.s IL_0032\n IL_0031: ldc.i4.1\n IL_0032: pop\n IL_0033: ret\n}\n\");\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 54 (0x36)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0010: bne.un.s IL_0033\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001e: call \"\"T C<T>.op_Equality(C<T>, C<T>)\"\"\n IL_0023: constrained. \"\"T\"\"\n IL_0029: call \"\"bool I1<T>.op_False(T)\"\"\n IL_002e: ldc.i4.0\n IL_002f: ceq\n IL_0031: br.s IL_0034\n IL_0033: ldc.i4.0\n IL_0034: pop\n IL_0035: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0010: bne.un.s IL_0030\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001e: call \"\"T C<T>.op_Inequality(C<T>, C<T>)\"\"\n IL_0023: constrained. \"\"T\"\"\n IL_0029: call \"\"bool I1<T>.op_True(T)\"\"\n IL_002e: br.s IL_0031\n IL_0030: ldc.i4.1\n IL_0031: pop\n IL_0032: ret\n}\n\");\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().First();\n\n Assert.Equal(\"x \" + op + \" x\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// Information about user-defined operators isn't exposed today.\n@\"\nITupleBinaryOperation (BinaryOperatorKind.\" + (op == \"==\" ? \"Equals\" : \"NotEquals\") + @\") (OperationKind.TupleBinary, Type: System.Boolean) (Syntax: 'x \" + op + @\" x')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, C<T>)) (Syntax: 'x')\n Right: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, C<T>)) (Syntax: 'x')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractTrueFalseOperatorForTupleEquality_04([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, C<T>) x) where T : I1\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + \" x\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (21,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"true\").WithLocation(21, 35),\n // (22,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"false\").WithLocation(22, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractTrueFalseOperatorForTupleEquality_06([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator true (I1 x);\n abstract static bool operator false (I1 x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, C<T>) x) where T : I1\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + \" x\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (21,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"true\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(21, 35),\n // (22,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"false\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(22, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperator_01([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npartial interface I1\n{\n abstract static I1 operator\" + op + @\" (I1 x, int y);\n\n static void M02(I1 x)\n {\n _ = x \" + op + @\" 1;\n }\n\n void M03(I1 y)\n {\n _ = y \" + op + @\" 2;\n }\n}\n\nclass Test\n{\n static void MT1(I1 a)\n {\n _ = a \" + op + @\" 3;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b \" + op + @\" 4).ToString());\n }\n}\n\";\n\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1\n{\n abstract static I1 operator\" + matchingOp + @\" (I1 x, int y);\n}\n\";\n }\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = x - 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x \" + op + \" 1\").WithLocation(8, 13),\n // (13,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = y - 2;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y \" + op + \" 2\").WithLocation(13, 13),\n // (21,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = a - 3;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a \" + op + \" 3\").WithLocation(21, 13),\n // (26,78): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b - 4).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"b \" + op + \" 4\").WithLocation(26, 78)\n );\n }\n\n [Theory]\n [InlineData(\"&\", true, false, false, false)]\n [InlineData(\"|\", true, false, false, false)]\n [InlineData(\"&\", false, false, true, false)]\n [InlineData(\"|\", false, true, false, false)]\n [InlineData(\"&\", true, false, true, false)]\n [InlineData(\"|\", true, true, false, false)]\n [InlineData(\"&\", false, true, false, true)]\n [InlineData(\"|\", false, false, true, true)]\n public void ConsumeAbstractLogicalBinaryOperator_01(string op, bool binaryIsAbstract, bool trueIsAbstract, bool falseIsAbstract, bool success)\n {\n var source1 =\n@\"\ninterface I1\n{\n \" + (binaryIsAbstract ? \"abstract \" : \"\") + @\"static I1 operator\" + op + @\" (I1 x, I1 y)\" + (binaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (trueIsAbstract ? \"abstract \" : \"\") + @\"static bool operator true (I1 x)\" + (trueIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (falseIsAbstract ? \"abstract \" : \"\") + @\"static bool operator false (I1 x)\" + (falseIsAbstract ? \";\" : \" => throw null;\") + @\"\n\n static void M02(I1 x)\n {\n _ = x \" + op + op + @\" x;\n }\n\n void M03(I1 y)\n {\n _ = y \" + op + op + @\" y;\n }\n}\n\nclass Test\n{\n static void MT1(I1 a)\n {\n _ = a \" + op + op + @\" a;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b \" + op + op + @\" b).ToString());\n }\n\n static void MT3(I1 b, dynamic c)\n {\n _ = b \" + op + op + @\" c;\n }\n\";\n if (!success)\n {\n source1 +=\n@\"\n static void MT4<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T, dynamic>>)((T d, dynamic e) => (d \" + op + op + @\" e).ToString());\n }\n\";\n }\n\n source1 +=\n@\"\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n if (success)\n {\n Assert.False(binaryIsAbstract);\n Assert.False(op == \"&\" ? falseIsAbstract : trueIsAbstract);\n var binaryMetadataName = op == \"&\" ? \"op_BitwiseAnd\" : \"op_BitwiseOr\";\n var unaryMetadataName = op == \"&\" ? \"op_False\" : \"op_True\";\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.MT1(I1)\",\n@\"\n{\n // Code size 22 (0x16)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloc.0\n IL_0004: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_0009: brtrue.s IL_0015\n IL_000b: ldloc.0\n IL_000c: ldarg.0\n IL_000d: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0012: pop\n IL_0013: br.s IL_0015\n IL_0015: ret\n}\n\");\n\n if (op == \"&\")\n {\n verifier.VerifyIL(\"Test.MT3(I1, dynamic)\",\n@\"\n{\n // Code size 97 (0x61)\n .maxstack 8\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: call \"\"bool I1.op_False(I1)\"\"\n IL_0007: brtrue.s IL_0060\n IL_0009: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_000e: brfalse.s IL_0012\n IL_0010: br.s IL_0047\n IL_0012: ldc.i4.8\n IL_0013: ldc.i4.2\n IL_0014: ldtoken \"\"Test\"\"\n IL_0019: call \"\"System.Type System.Type.GetTypeFromHandle(System.RuntimeTypeHandle)\"\"\n IL_001e: ldc.i4.2\n IL_001f: newarr \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo\"\"\n IL_0024: dup\n IL_0025: ldc.i4.0\n IL_0026: ldc.i4.1\n IL_0027: ldnull\n IL_0028: call \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags, string)\"\"\n IL_002d: stelem.ref\n IL_002e: dup\n IL_002f: ldc.i4.1\n IL_0030: ldc.i4.0\n IL_0031: ldnull\n IL_0032: call \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags, string)\"\"\n IL_0037: stelem.ref\n IL_0038: call \"\"System.Runtime.CompilerServices.CallSiteBinder Microsoft.CSharp.RuntimeBinder.Binder.BinaryOperation(Microsoft.CSharp.RuntimeBinder.CSharpBinderFlags, System.Linq.Expressions.ExpressionType, System.Type, System.Collections.Generic.IEnumerable<Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo>)\"\"\n IL_003d: call \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>>.Create(System.Runtime.CompilerServices.CallSiteBinder)\"\"\n IL_0042: stsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_0047: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_004c: ldfld \"\"System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic> System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>>.Target\"\"\n IL_0051: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_0056: ldarg.0\n IL_0057: ldarg.1\n IL_0058: callvirt \"\"dynamic System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>.Invoke(System.Runtime.CompilerServices.CallSite, I1, dynamic)\"\"\n IL_005d: pop\n IL_005e: br.s IL_0060\n IL_0060: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.MT3(I1, dynamic)\",\n@\"\n{\n // Code size 98 (0x62)\n .maxstack 8\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: call \"\"bool I1.op_True(I1)\"\"\n IL_0007: brtrue.s IL_0061\n IL_0009: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_000e: brfalse.s IL_0012\n IL_0010: br.s IL_0048\n IL_0012: ldc.i4.8\n IL_0013: ldc.i4.s 36\n IL_0015: ldtoken \"\"Test\"\"\n IL_001a: call \"\"System.Type System.Type.GetTypeFromHandle(System.RuntimeTypeHandle)\"\"\n IL_001f: ldc.i4.2\n IL_0020: newarr \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo\"\"\n IL_0025: dup\n IL_0026: ldc.i4.0\n IL_0027: ldc.i4.1\n IL_0028: ldnull\n IL_0029: call \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags, string)\"\"\n IL_002e: stelem.ref\n IL_002f: dup\n IL_0030: ldc.i4.1\n IL_0031: ldc.i4.0\n IL_0032: ldnull\n IL_0033: call \"\"Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags, string)\"\"\n IL_0038: stelem.ref\n IL_0039: call \"\"System.Runtime.CompilerServices.CallSiteBinder Microsoft.CSharp.RuntimeBinder.Binder.BinaryOperation(Microsoft.CSharp.RuntimeBinder.CSharpBinderFlags, System.Linq.Expressions.ExpressionType, System.Type, System.Collections.Generic.IEnumerable<Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo>)\"\"\n IL_003e: call \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>>.Create(System.Runtime.CompilerServices.CallSiteBinder)\"\"\n IL_0043: stsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_0048: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_004d: ldfld \"\"System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic> System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>>.Target\"\"\n IL_0052: ldsfld \"\"System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>> Test.<>o__2.<>p__0\"\"\n IL_0057: ldarg.0\n IL_0058: ldarg.1\n IL_0059: callvirt \"\"dynamic System.Func<System.Runtime.CompilerServices.CallSite, I1, dynamic, dynamic>.Invoke(System.Runtime.CompilerServices.CallSite, I1, dynamic)\"\"\n IL_005e: pop\n IL_005f: br.s IL_0061\n IL_0061: ret\n}\n\");\n }\n }\n else\n {\n var builder = ArrayBuilder<DiagnosticDescription>.GetInstance();\n\n builder.AddRange(\n // (10,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = x && x;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x \" + op + op + \" x\").WithLocation(10, 13),\n // (15,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = y && y;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y \" + op + op + \" y\").WithLocation(15, 13),\n // (23,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = a && a;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a \" + op + op + \" a\").WithLocation(23, 13),\n // (28,78): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b && b).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"b \" + op + op + \" b\").WithLocation(28, 78)\n );\n\n if (op == \"&\" ? falseIsAbstract : trueIsAbstract)\n {\n builder.Add(\n // (33,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = b || c;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"b \" + op + op + \" c\").WithLocation(33, 13)\n );\n }\n\n builder.Add(\n // (38,98): error CS7083: Expression must be implicitly convertible to Boolean or its type 'T' must define operator 'true'.\n // _ = (System.Linq.Expressions.Expression<System.Action<T, dynamic>>)((T d, dynamic e) => (d || e).ToString());\n Diagnostic(ErrorCode.ERR_InvalidDynamicCondition, \"d\").WithArguments(\"T\", op == \"&\" ? \"false\" : \"true\").WithLocation(38, 98)\n );\n\n compilation1.VerifyDiagnostics(builder.ToArrayAndFree());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractCompoundBinaryOperator_01([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\")] string op)\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static I1 operator\" + op + @\" (I1 x, int y);\n\n static void M02(I1 x)\n {\n x \" + op + @\"= 1;\n }\n\n void M03(I1 y)\n {\n y \" + op + @\"= 2;\n }\n}\n\ninterface I2<T> where T : I2<T>\n{\n abstract static T operator\" + op + @\" (T x, int y);\n}\n\nclass Test\n{\n static void MT1(I1 a)\n {\n a \" + op + @\"= 3;\n }\n\n static void MT2<T>() where T : I2<T>\n {\n _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b \" + op + @\"= 4).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // x /= 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x \" + op + \"= 1\").WithLocation(8, 9),\n // (13,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // y /= 2;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y \" + op + \"= 2\").WithLocation(13, 9),\n // (26,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // a /= 3;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a \" + op + \"= 3\").WithLocation(26, 9),\n // (31,78): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action<T>>)((T b) => (b /= 4).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, \"b \" + op + \"= 4\").WithLocation(31, 78)\n );\n }\n\n private static string BinaryOperatorKind(string op)\n {\n switch (op)\n {\n case \"+\":\n return \"Add\";\n\n case \"-\":\n return \"Subtract\";\n\n case \"*\":\n return \"Multiply\";\n\n case \"/\":\n return \"Divide\";\n\n case \"%\":\n return \"Remainder\";\n\n case \"<<\":\n return \"LeftShift\";\n\n case \">>\":\n return \"RightShift\";\n\n case \"&\":\n return \"And\";\n\n case \"|\":\n return \"Or\";\n\n case \"^\":\n return \"ExclusiveOr\";\n\n case \"<\":\n return \"LessThan\";\n\n case \"<=\":\n return \"LessThanOrEqual\";\n\n case \"==\":\n return \"Equals\";\n\n case \"!=\":\n return \"NotEquals\";\n\n case \">=\":\n return \"GreaterThanOrEqual\";\n\n case \">\":\n return \"GreaterThan\";\n\n }\n\n throw TestExceptionUtilities.UnexpectedValue(op);\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperatorForTupleEquality_01([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static bool operator == (T x, T y);\n abstract static bool operator != (T x, T y);\n\n abstract static bool operator == (I1<T> x, I1<T> y);\n abstract static bool operator != (I1<T> x, I1<T> y);\n\n static void M02((int, I1<T>) x)\n {\n _ = x \" + op + @\" x;\n }\n\n void M03((int, I1<T>) y)\n {\n _ = y \" + op + @\" y;\n }\n}\n\nclass Test\n{\n static void MT1<T>((int, I1<T>) a) where T : I1<T>\n {\n _ = a \" + op + @\" a;\n }\n\n static void MT2<T>() where T : I1<T>\n {\n _ = (System.Linq.Expressions.Expression<System.Action<(int, T)>>)(((int, T) b) => (b \" + op + @\" b).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (12,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x \" + op + \" x\").WithLocation(12, 13),\n // (17,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = y == y;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"y \" + op + \" y\").WithLocation(17, 13),\n // (25,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = a == a;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"a \" + op + \" a\").WithLocation(25, 13),\n // (30,92): error CS8382: An expression tree may not contain a tuple == or != operator\n // _ = (System.Linq.Expressions.Expression<System.Action<(int, T)>>)(((int, T) b) => (b == b).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsTupleBinOp, \"b \" + op + \" b\").WithLocation(30, 92)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperator_03([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\")] string op)\n {\n string metadataName = BinaryOperatorName(op);\n\n bool isShiftOperator = op is \"<<\" or \">>\";\n\n var source1 =\n@\"\npublic partial interface I1<T0> where T0 : I1<T0>\n{\n abstract static T0 operator\" + op + @\" (T0 x, int a);\n}\n\npartial class Test\n{\n static void M03<T, U>(T x) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" 1;\n }\n\n static void M05<T, U>(T? y) where T : struct, U where U : I1<T>\n {\n _ = y \" + op + @\" 1;\n }\n}\n\";\n\n if (!isShiftOperator)\n {\n source1 += @\"\npublic partial interface I1<T0>\n{\n abstract static T0 operator\" + op + @\" (int a, T0 x);\n abstract static T0 operator\" + op + @\" (I1<T0> x, T0 a);\n abstract static T0 operator\" + op + @\" (T0 x, I1<T0> a);\n}\n\npartial class Test\n{\n static void M02<T, U>(T x) where T : U where U : I1<T>\n {\n _ = 1 \" + op + @\" x;\n }\n\n static void M04<T, U>(T? y) where T : struct, U where U : I1<T>\n {\n _ = 1 \" + op + @\" y;\n }\n\n static void M06<T, U>(I1<T> x, T y) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" y;\n }\n\n static void M07<T, U>(T x, I1<T> y) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" y;\n }\n}\n\";\n }\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (!isShiftOperator)\n {\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldc.i4.1\n IL_0002: ldarg.0\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (T? V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_000e\n IL_000c: br.s IL_0022\n IL_000e: ldc.i4.1\n IL_000f: ldloca.s V_0\n IL_0011: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0016: constrained. \"\"T\"\"\n IL_001c: call \"\"T I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n }\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldc.i4.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M05<T, U>(T?)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (T? V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_000e\n IL_000c: br.s IL_0022\n IL_000e: ldloca.s V_0\n IL_0010: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0015: ldc.i4.1\n IL_0016: constrained. \"\"T\"\"\n IL_001c: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (!isShiftOperator)\n {\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldc.i4.1\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?)\",\n@\"\n{\n // Code size 32 (0x20)\n .maxstack 2\n .locals init (T? V_0)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brfalse.s IL_001f\n IL_000b: ldc.i4.1\n IL_000c: ldloca.s V_0\n IL_000e: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0013: constrained. \"\"T\"\"\n IL_0019: call \"\"T I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_001e: pop\n IL_001f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n }\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldc.i4.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M05<T, U>(T?)\",\n@\"\n{\n // Code size 32 (0x20)\n .maxstack 2\n .locals init (T? V_0)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brfalse.s IL_001f\n IL_000b: ldloca.s V_0\n IL_000d: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0012: ldc.i4.1\n IL_0013: constrained. \"\"T\"\"\n IL_0019: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_001e: pop\n IL_001f: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + \" 1\").Single();\n\n Assert.Equal(\"x \" + op + \" 1\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIBinaryOperation (BinaryOperatorKind.\" + BinaryOperatorKind(op) + @\") (OperatorMethod: T I1<T>.\" + metadataName + @\"(T x, System.Int32 a)) (OperationKind.Binary, Type: T) (Syntax: 'x \" + op + @\" 1')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n Right: \n ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 1) (Syntax: '1')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractComparisonBinaryOperator_03([CombinatorialValues(\"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n string metadataName = BinaryOperatorName(op);\n\n var source1 =\n@\"\npublic partial interface I1<T0> where T0 : I1<T0>\n{\n abstract static bool operator\" + op + @\" (T0 x, int a);\n abstract static bool operator\" + op + @\" (int a, T0 x);\n abstract static bool operator\" + op + @\" (I1<T0> x, T0 a);\n abstract static bool operator\" + op + @\" (T0 x, I1<T0> a);\n}\n\npartial class Test\n{\n static void M02<T, U>(T x) where T : U where U : I1<T>\n {\n _ = 1 \" + op + @\" x;\n }\n\n static void M03<T, U>(T x) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" 1;\n }\n\n static void M06<T, U>(I1<T> x, T y) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" y;\n }\n\n static void M07<T, U>(T x, I1<T> y) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" y;\n }\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n source1 +=\n@\"\npublic partial interface I1<T0>\n{\n abstract static bool operator\" + matchingOp + @\" (T0 x, int a);\n abstract static bool operator\" + matchingOp + @\" (int a, T0 x);\n abstract static bool operator\" + matchingOp + @\" (I1<T0> x, T0 a);\n abstract static bool operator\" + matchingOp + @\" (T0 x, I1<T0> a);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldc.i4.1\n IL_0002: ldarg.0\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldc.i4.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000e: pop\n IL_000f: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldc.i4.1\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"bool I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"bool I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"bool I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldc.i4.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"bool I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000d: pop\n IL_000e: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + \" 1\").Single();\n\n Assert.Equal(\"x \" + op + \" 1\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIBinaryOperation (BinaryOperatorKind.\" + BinaryOperatorKind(op) + @\") (OperatorMethod: System.Boolean I1<T>.\" + metadataName + @\"(T x, System.Int32 a)) (OperationKind.Binary, Type: System.Boolean) (Syntax: 'x \" + op + @\" 1')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n Right: \n ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 1) (Syntax: '1')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractLiftedComparisonBinaryOperator_03([CombinatorialValues(\"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n string metadataName = BinaryOperatorName(op);\n\n var source1 =\n@\"\npublic partial interface I1<T0> where T0 : I1<T0>\n{\n abstract static bool operator\" + op + @\" (T0 x, T0 a);\n}\n\npartial class Test\n{\n static void M04<T, U>(T? x, T? y) where T : struct, U where U : I1<T>\n {\n _ = x \" + op + @\" y;\n }\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n source1 +=\n@\"\npublic partial interface I1<T0>\n{\n abstract static bool operator\" + matchingOp + @\" (T0 x, T0 a);\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (op is \"==\" or \"!=\")\n {\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 61 (0x3d)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.1\n IL_0004: stloc.1\n IL_0005: ldloca.s V_0\n IL_0007: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000c: ldloca.s V_1\n IL_000e: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0013: beq.s IL_0017\n IL_0015: br.s IL_003c\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly bool T?.HasValue.get\"\"\n IL_001e: brtrue.s IL_0022\n IL_0020: br.s IL_003c\n IL_0022: ldloca.s V_0\n IL_0024: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0029: ldloca.s V_1\n IL_002b: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0030: constrained. \"\"T\"\"\n IL_0036: call \"\"bool I1<T>.\" + metadataName + @\"(T, T)\"\"\n IL_003b: pop\n IL_003c: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.1\n IL_0004: stloc.1\n IL_0005: ldloca.s V_0\n IL_0007: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000c: ldloca.s V_1\n IL_000e: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0013: and\n IL_0014: brtrue.s IL_0018\n IL_0016: br.s IL_0032\n IL_0018: ldloca.s V_0\n IL_001a: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001f: ldloca.s V_1\n IL_0021: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0026: constrained. \"\"T\"\"\n IL_002c: call \"\"bool I1<T>.\" + metadataName + @\"(T, T)\"\"\n IL_0031: pop\n IL_0032: ret\n}\n\");\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (op is \"==\" or \"!=\")\n {\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 56 (0x38)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.1\n IL_0003: stloc.1\n IL_0004: ldloca.s V_0\n IL_0006: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000b: ldloca.s V_1\n IL_000d: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0012: bne.un.s IL_0037\n IL_0014: ldloca.s V_0\n IL_0016: call \"\"readonly bool T?.HasValue.get\"\"\n IL_001b: brfalse.s IL_0037\n IL_001d: ldloca.s V_0\n IL_001f: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0024: ldloca.s V_1\n IL_0026: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_002b: constrained. \"\"T\"\"\n IL_0031: call \"\"bool I1<T>.\" + metadataName + @\"(T, T)\"\"\n IL_0036: pop\n IL_0037: ret\n}\n\");\n\n }\n else\n {\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 48 (0x30)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.1\n IL_0003: stloc.1\n IL_0004: ldloca.s V_0\n IL_0006: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000b: ldloca.s V_1\n IL_000d: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0012: and\n IL_0013: brfalse.s IL_002f\n IL_0015: ldloca.s V_0\n IL_0017: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001c: ldloca.s V_1\n IL_001e: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0023: constrained. \"\"T\"\"\n IL_0029: call \"\"bool I1<T>.\" + metadataName + @\"(T, T)\"\"\n IL_002e: pop\n IL_002f: ret\n}\n\");\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + \" y\").Single();\n\n Assert.Equal(\"x \" + op + \" y\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIBinaryOperation (BinaryOperatorKind.\" + BinaryOperatorKind(op) + @\", IsLifted) (OperatorMethod: System.Boolean I1<T>.\" + metadataName + @\"(T x, T a)) (OperationKind.Binary, Type: System.Boolean) (Syntax: 'x \" + op + @\" y')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T?) (Syntax: 'x')\n Right: \n IParameterReferenceOperation: y (OperationKind.ParameterReference, Type: T?) (Syntax: 'y')\n\");\n }\n\n [Theory]\n [InlineData(\"&\", true, true)]\n [InlineData(\"|\", true, true)]\n [InlineData(\"&\", true, false)]\n [InlineData(\"|\", true, false)]\n [InlineData(\"&\", false, true)]\n [InlineData(\"|\", false, true)]\n public void ConsumeAbstractLogicalBinaryOperator_03(string op, bool binaryIsAbstract, bool unaryIsAbstract)\n {\n var binaryMetadataName = op == \"&\" ? \"op_BitwiseAnd\" : \"op_BitwiseOr\";\n var unaryMetadataName = op == \"&\" ? \"op_False\" : \"op_True\";\n var opKind = op == \"&\" ? \"ConditionalAnd\" : \"ConditionalOr\";\n\n if (binaryIsAbstract && unaryIsAbstract)\n {\n consumeAbstract(op);\n }\n else\n {\n consumeMixed(op, binaryIsAbstract, unaryIsAbstract);\n }\n\n void consumeAbstract(string op)\n {\n var source1 =\n@\"\npublic interface I1<T0> where T0 : I1<T0>\n{\n abstract static T0 operator\" + op + @\" (T0 a, T0 x);\n abstract static bool operator true (T0 x);\n abstract static bool operator false (T0 x);\n}\n\npublic interface I2<T0> where T0 : struct, I2<T0>\n{\n abstract static T0 operator\" + op + @\" (T0 a, T0 x);\n abstract static bool operator true (T0? x);\n abstract static bool operator false (T0? x);\n}\n\nclass Test\n{\n static void M03<T, U>(T x, T y) where T : U where U : I1<T>\n {\n _ = x \" + op + op + @\" y;\n }\n\n static void M04<T, U>(T? x, T? y) where T : struct, U where U : I2<T>\n {\n _ = x \" + op + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 34 (0x22)\n .maxstack 2\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloc.0\n IL_0004: constrained. \"\"T\"\"\n IL_000a: call \"\"bool I1<T>.\" + unaryMetadataName + @\"(T)\"\"\n IL_000f: brtrue.s IL_0021\n IL_0011: ldloc.0\n IL_0012: ldarg.1\n IL_0013: constrained. \"\"T\"\"\n IL_0019: call \"\"T I1<T>.\" + binaryMetadataName + @\"(T, T)\"\"\n IL_001e: pop\n IL_001f: br.s IL_0021\n IL_0021: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 69 (0x45)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1,\n T? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloc.0\n IL_0004: constrained. \"\"T\"\"\n IL_000a: call \"\"bool I2<T>.\" + unaryMetadataName + @\"(T?)\"\"\n IL_000f: brtrue.s IL_0044\n IL_0011: ldloc.0\n IL_0012: stloc.1\n IL_0013: ldarg.1\n IL_0014: stloc.2\n IL_0015: ldloca.s V_1\n IL_0017: call \"\"readonly bool T?.HasValue.get\"\"\n IL_001c: ldloca.s V_2\n IL_001e: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0023: and\n IL_0024: brtrue.s IL_0028\n IL_0026: br.s IL_0042\n IL_0028: ldloca.s V_1\n IL_002a: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_002f: ldloca.s V_2\n IL_0031: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0036: constrained. \"\"T\"\"\n IL_003c: call \"\"T I2<T>.\" + binaryMetadataName + @\"(T, T)\"\"\n IL_0041: pop\n IL_0042: br.s IL_0044\n IL_0044: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 31 (0x1f)\n .maxstack 2\n .locals init (T V_0)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloc.0\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I1<T>.\" + unaryMetadataName + @\"(T)\"\"\n IL_000e: brtrue.s IL_001e\n IL_0010: ldloc.0\n IL_0011: ldarg.1\n IL_0012: constrained. \"\"T\"\"\n IL_0018: call \"\"T I1<T>.\" + binaryMetadataName + @\"(T, T)\"\"\n IL_001d: pop\n IL_001e: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 64 (0x40)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1,\n T? V_2)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloc.0\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"bool I2<T>.\" + unaryMetadataName + @\"(T?)\"\"\n IL_000e: brtrue.s IL_003f\n IL_0010: ldloc.0\n IL_0011: stloc.1\n IL_0012: ldarg.1\n IL_0013: stloc.2\n IL_0014: ldloca.s V_1\n IL_0016: call \"\"readonly bool T?.HasValue.get\"\"\n IL_001b: ldloca.s V_2\n IL_001d: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0022: and\n IL_0023: brfalse.s IL_003f\n IL_0025: ldloca.s V_1\n IL_0027: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_002c: ldloca.s V_2\n IL_002e: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_0033: constrained. \"\"T\"\"\n IL_0039: call \"\"T I2<T>.\" + binaryMetadataName + @\"(T, T)\"\"\n IL_003e: pop\n IL_003f: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node1 = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + op + \" y\").First();\n\n Assert.Equal(\"x \" + op + op + \" y\", node1.ToString());\n\n VerifyOperationTreeForNode(compilation1, model, node1,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIBinaryOperation (BinaryOperatorKind.\" + opKind + @\") (OperatorMethod: T I1<T>.\" + binaryMetadataName + @\"(T a, T x)) (OperationKind.Binary, Type: T) (Syntax: 'x \" + op + op + @\" y')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n Right: \n IParameterReferenceOperation: y (OperationKind.ParameterReference, Type: T) (Syntax: 'y')\n\");\n }\n\n void consumeMixed(string op, bool binaryIsAbstract, bool unaryIsAbstract)\n {\n var source1 =\n@\"\npublic interface I1\n{\n \" + (binaryIsAbstract ? \"abstract \" : \"\") + @\"static I1 operator\" + op + @\" (I1 a, I1 x)\" + (binaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (unaryIsAbstract ? \"abstract \" : \"\") + @\"static bool operator true (I1 x)\" + (unaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (unaryIsAbstract ? \"abstract \" : \"\") + @\"static bool operator false (I1 x)\" + (unaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n}\n\nclass Test\n{\n static void M03<T, U>(T x, T y) where T : U where U : I1\n {\n _ = x \" + op + op + @\" y;\n }\n\n static void M04<T, U>(T? x, T? y) where T : struct, U where U : I1\n {\n _ = x \" + op + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n switch (binaryIsAbstract, unaryIsAbstract)\n {\n case (true, false):\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 38 (0x26)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T\"\"\n IL_0007: stloc.0\n IL_0008: ldloc.0\n IL_0009: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_000e: brtrue.s IL_0025\n IL_0010: ldloc.0\n IL_0011: ldarg.1\n IL_0012: box \"\"T\"\"\n IL_0017: constrained. \"\"T\"\"\n IL_001d: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0022: pop\n IL_0023: br.s IL_0025\n IL_0025: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 38 (0x26)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T?\"\"\n IL_0007: stloc.0\n IL_0008: ldloc.0\n IL_0009: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_000e: brtrue.s IL_0025\n IL_0010: ldloc.0\n IL_0011: ldarg.1\n IL_0012: box \"\"T?\"\"\n IL_0017: constrained. \"\"T\"\"\n IL_001d: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0022: pop\n IL_0023: br.s IL_0025\n IL_0025: ret\n}\n\");\n break;\n\n case (false, true):\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 38 (0x26)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T\"\"\n IL_0007: stloc.0\n IL_0008: ldloc.0\n IL_0009: constrained. \"\"T\"\"\n IL_000f: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_0014: brtrue.s IL_0025\n IL_0016: ldloc.0\n IL_0017: ldarg.1\n IL_0018: box \"\"T\"\"\n IL_001d: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0022: pop\n IL_0023: br.s IL_0025\n IL_0025: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 38 (0x26)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T?\"\"\n IL_0007: stloc.0\n IL_0008: ldloc.0\n IL_0009: constrained. \"\"T\"\"\n IL_000f: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_0014: brtrue.s IL_0025\n IL_0016: ldloc.0\n IL_0017: ldarg.1\n IL_0018: box \"\"T?\"\"\n IL_001d: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0022: pop\n IL_0023: br.s IL_0025\n IL_0025: ret\n}\n\");\n break;\n\n default:\n Assert.True(false);\n break;\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n switch (binaryIsAbstract, unaryIsAbstract)\n {\n case (true, false):\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: ldarg.0\n IL_0001: box \"\"T\"\"\n IL_0006: stloc.0\n IL_0007: ldloc.0\n IL_0008: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_000d: brtrue.s IL_0022\n IL_000f: ldloc.0\n IL_0010: ldarg.1\n IL_0011: box \"\"T\"\"\n IL_0016: constrained. \"\"T\"\"\n IL_001c: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: ldarg.0\n IL_0001: box \"\"T?\"\"\n IL_0006: stloc.0\n IL_0007: ldloc.0\n IL_0008: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_000d: brtrue.s IL_0022\n IL_000f: ldloc.0\n IL_0010: ldarg.1\n IL_0011: box \"\"T?\"\"\n IL_0016: constrained. \"\"T\"\"\n IL_001c: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n break;\n\n case (false, true):\n verifier.VerifyIL(\"Test.M03<T, U>(T, T)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: ldarg.0\n IL_0001: box \"\"T\"\"\n IL_0006: stloc.0\n IL_0007: ldloc.0\n IL_0008: constrained. \"\"T\"\"\n IL_000e: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_0013: brtrue.s IL_0022\n IL_0015: ldloc.0\n IL_0016: ldarg.1\n IL_0017: box \"\"T\"\"\n IL_001c: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?, T?)\",\n@\"\n{\n // Code size 35 (0x23)\n .maxstack 2\n .locals init (I1 V_0)\n IL_0000: ldarg.0\n IL_0001: box \"\"T?\"\"\n IL_0006: stloc.0\n IL_0007: ldloc.0\n IL_0008: constrained. \"\"T\"\"\n IL_000e: call \"\"bool I1.\" + unaryMetadataName + @\"(I1)\"\"\n IL_0013: brtrue.s IL_0022\n IL_0015: ldloc.0\n IL_0016: ldarg.1\n IL_0017: box \"\"T?\"\"\n IL_001c: call \"\"I1 I1.\" + binaryMetadataName + @\"(I1, I1)\"\"\n IL_0021: pop\n IL_0022: ret\n}\n\");\n break;\n\n default:\n Assert.True(false);\n break;\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node1 = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + op + \" y\").First();\n\n Assert.Equal(\"x \" + op + op + \" y\", node1.ToString());\n\n VerifyOperationTreeForNode(compilation1, model, node1,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIBinaryOperation (BinaryOperatorKind.\" + opKind + @\") (OperatorMethod: I1 I1.\" + binaryMetadataName + @\"(I1 a, I1 x)) (OperationKind.Binary, Type: I1) (Syntax: 'x \" + op + op + @\" y')\n Left: \n IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: I1, IsImplicit) (Syntax: 'x')\n Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)\n Operand: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n Right: \n IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: I1, IsImplicit) (Syntax: 'y')\n Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)\n Operand: \n IParameterReferenceOperation: y (OperationKind.ParameterReference, Type: T) (Syntax: 'y')\n\");\n }\n }\n\n [Theory]\n [InlineData(\"+\", \"op_Addition\", \"Add\")]\n [InlineData(\"-\", \"op_Subtraction\", \"Subtract\")]\n [InlineData(\"*\", \"op_Multiply\", \"Multiply\")]\n [InlineData(\"/\", \"op_Division\", \"Divide\")]\n [InlineData(\"%\", \"op_Modulus\", \"Remainder\")]\n [InlineData(\"&\", \"op_BitwiseAnd\", \"And\")]\n [InlineData(\"|\", \"op_BitwiseOr\", \"Or\")]\n [InlineData(\"^\", \"op_ExclusiveOr\", \"ExclusiveOr\")]\n [InlineData(\"<<\", \"op_LeftShift\", \"LeftShift\")]\n [InlineData(\">>\", \"op_RightShift\", \"RightShift\")]\n public void ConsumeAbstractCompoundBinaryOperator_03(string op, string metadataName, string operatorKind)\n {\n bool isShiftOperator = op.Length == 2;\n\n var source1 =\n@\"\npublic interface I1<T0> where T0 : I1<T0>\n{\n\";\n if (!isShiftOperator)\n {\n source1 += @\"\n abstract static int operator\" + op + @\" (int a, T0 x);\n abstract static I1<T0> operator\" + op + @\" (I1<T0> x, T0 a);\n abstract static T0 operator\" + op + @\" (T0 x, I1<T0> a);\n\";\n }\n\n source1 += @\"\n abstract static T0 operator\" + op + @\" (T0 x, int a);\n}\n\nclass Test\n{\n\";\n if (!isShiftOperator)\n {\n source1 += @\"\n static void M02<T, U>(int a, T x) where T : U where U : I1<T>\n {\n a \" + op + @\"= x;\n }\n\n static void M04<T, U>(int? a, T? y) where T : struct, U where U : I1<T>\n {\n a \" + op + @\"= y;\n }\n\n static void M06<T, U>(I1<T> x, T y) where T : U where U : I1<T>\n {\n x \" + op + @\"= y;\n }\n\n static void M07<T, U>(T x, I1<T> y) where T : U where U : I1<T>\n {\n x \" + op + @\"= y;\n }\n\";\n }\n\n source1 += @\"\n static void M03<T, U>(T x) where T : U where U : I1<T>\n {\n x \" + op + @\"= 1;\n }\n\n static void M05<T, U>(T? y) where T : struct, U where U : I1<T>\n {\n y \" + op + @\"= 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (!isShiftOperator)\n {\n verifier.VerifyIL(\"Test.M02<T, U>(int, T)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"int I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000e: starg.s V_0\n IL_0010: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(int?, T?)\",\n@\"\n{\n // Code size 66 (0x42)\n .maxstack 2\n .locals init (int? V_0,\n T? V_1,\n int? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.1\n IL_0004: stloc.1\n IL_0005: ldloca.s V_0\n IL_0007: call \"\"readonly bool int?.HasValue.get\"\"\n IL_000c: ldloca.s V_1\n IL_000e: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0013: and\n IL_0014: brtrue.s IL_0021\n IL_0016: ldloca.s V_2\n IL_0018: initobj \"\"int?\"\"\n IL_001e: ldloc.2\n IL_001f: br.s IL_003f\n IL_0021: ldloca.s V_0\n IL_0023: call \"\"readonly int int?.GetValueOrDefault()\"\"\n IL_0028: ldloca.s V_1\n IL_002a: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_002f: constrained. \"\"T\"\"\n IL_0035: call \"\"int I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_003a: newobj \"\"int?..ctor(int)\"\"\n IL_003f: starg.s V_0\n IL_0041: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"I1<T> I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000e: starg.s V_0\n IL_0010: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldarg.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000e: starg.s V_0\n IL_0010: ret\n}\n\");\n }\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 2\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: ldc.i4.1\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000e: starg.s V_0\n IL_0010: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M05<T, U>(T?)\",\n@\"\n{\n // Code size 50 (0x32)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"T?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002f\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001e: ldc.i4.1\n IL_001f: constrained. \"\"T\"\"\n IL_0025: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_002a: newobj \"\"T?..ctor(T)\"\"\n IL_002f: starg.s V_0\n IL_0031: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (!isShiftOperator)\n {\n verifier.VerifyIL(\"Test.M02<T, U>(int, T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"int I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(int?, T?)\",\n@\"\n{\n // Code size 65 (0x41)\n .maxstack 2\n .locals init (int? V_0,\n T? V_1,\n int? V_2)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.1\n IL_0003: stloc.1\n IL_0004: ldloca.s V_0\n IL_0006: call \"\"readonly bool int?.HasValue.get\"\"\n IL_000b: ldloca.s V_1\n IL_000d: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0012: and\n IL_0013: brtrue.s IL_0020\n IL_0015: ldloca.s V_2\n IL_0017: initobj \"\"int?\"\"\n IL_001d: ldloc.2\n IL_001e: br.s IL_003e\n IL_0020: ldloca.s V_0\n IL_0022: call \"\"readonly int int?.GetValueOrDefault()\"\"\n IL_0027: ldloca.s V_1\n IL_0029: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_002e: constrained. \"\"T\"\"\n IL_0034: call \"\"int I1<T>.\" + metadataName + @\"(int, T)\"\"\n IL_0039: newobj \"\"int?..ctor(int)\"\"\n IL_003e: starg.s V_0\n IL_0040: ret\n}\n\");\n verifier.VerifyIL(\"Test.M06<T, U>(I1<T>, T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"I1<T> I1<T>.\" + metadataName + @\"(I1<T>, T)\"\"\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M07<T, U>(T, I1<T>)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T, I1<T>)\"\"\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n }\n\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 16 (0x10)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldc.i4.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_000d: starg.s V_0\n IL_000f: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M05<T, U>(T?)\",\n@\"\n{\n // Code size 49 (0x31)\n .maxstack 2\n .locals init (T? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brtrue.s IL_0016\n IL_000b: ldloca.s V_1\n IL_000d: initobj \"\"T?\"\"\n IL_0013: ldloc.1\n IL_0014: br.s IL_002e\n IL_0016: ldloca.s V_0\n IL_0018: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001d: ldc.i4.1\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"T I1<T>.\" + metadataName + @\"(T, int)\"\"\n IL_0029: newobj \"\"T?..ctor(T)\"\"\n IL_002e: starg.s V_0\n IL_0030: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>().Where(n => n.ToString() == \"x \" + op + \"= 1\").Single();\n\n Assert.Equal(\"x \" + op + \"= 1\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nICompoundAssignmentOperation (BinaryOperatorKind.\" + operatorKind + @\") (OperatorMethod: T I1<T>.\" + metadataName + @\"(T x, System.Int32 a)) (OperationKind.CompoundAssignment, Type: T) (Syntax: 'x \" + op + @\"= 1')\n InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)\n OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n Right: \n ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 1) (Syntax: '1')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperatorForTupleEquality_03([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static bool operator == (T x, T y);\n abstract static bool operator != (T x, T y);\n}\n\nclass Test\n{\n static void M02<T, U>((int, T) x) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, T>)\",\n@\"\n{\n // Code size 47 (0x2f)\n .maxstack 2\n .locals init (System.ValueTuple<int, T> V_0,\n System.ValueTuple<int, T> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_0011: bne.un.s IL_002c\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_001f: constrained. \"\"T\"\"\n IL_0025: call \"\"bool I1<T>.op_Equality(T, T)\"\"\n IL_002a: br.s IL_002d\n IL_002c: ldc.i4.0\n IL_002d: pop\n IL_002e: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, T>)\",\n@\"\n{\n // Code size 47 (0x2f)\n .maxstack 2\n .locals init (System.ValueTuple<int, T> V_0,\n System.ValueTuple<int, T> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_0011: bne.un.s IL_002c\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_001f: constrained. \"\"T\"\"\n IL_0025: call \"\"bool I1<T>.op_Inequality(T, T)\"\"\n IL_002a: br.s IL_002d\n IL_002c: ldc.i4.1\n IL_002d: pop\n IL_002e: ret\n}\n\");\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, T>)\",\n@\"\n{\n // Code size 46 (0x2e)\n .maxstack 2\n .locals init (System.ValueTuple<int, T> V_0,\n System.ValueTuple<int, T> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_0010: bne.un.s IL_002b\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"bool I1<T>.op_Equality(T, T)\"\"\n IL_0029: br.s IL_002c\n IL_002b: ldc.i4.0\n IL_002c: pop\n IL_002d: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, T>)\",\n@\"\n{\n // Code size 46 (0x2e)\n .maxstack 2\n .locals init (System.ValueTuple<int, T> V_0,\n System.ValueTuple<int, T> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, T>.Item1\"\"\n IL_0010: bne.un.s IL_002b\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"T System.ValueTuple<int, T>.Item2\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"bool I1<T>.op_Inequality(T, T)\"\"\n IL_0029: br.s IL_002c\n IL_002b: ldc.i4.1\n IL_002c: pop\n IL_002d: ret\n}\n\");\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().First();\n\n Assert.Equal(\"x \" + op + \" x\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// Information about user-defined operators isn't exposed today.\n@\"\nITupleBinaryOperation (BinaryOperatorKind.\" + (op == \"==\" ? \"Equals\" : \"NotEquals\") + @\") (OperationKind.TupleBinary, Type: System.Boolean) (Syntax: 'x \" + op + @\" x')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, T)) (Syntax: 'x')\n Right: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, T)) (Syntax: 'x')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperator_04([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator\" + op + @\" (I1 x, int y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, int y) where T : I1\n {\n _ = x \" + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x - y;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + \" y\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (12,32): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator- (I1 x, int y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(12, 32)\n );\n }\n\n [Theory]\n [InlineData(\"&\", true, false, false, false)]\n [InlineData(\"|\", true, false, false, false)]\n [InlineData(\"&\", false, false, true, false)]\n [InlineData(\"|\", false, true, false, false)]\n [InlineData(\"&\", true, false, true, false)]\n [InlineData(\"|\", true, true, false, false)]\n [InlineData(\"&\", false, true, false, true)]\n [InlineData(\"|\", false, false, true, true)]\n public void ConsumeAbstractLogicalBinaryOperator_04(string op, bool binaryIsAbstract, bool trueIsAbstract, bool falseIsAbstract, bool success)\n {\n var source1 =\n@\"\npublic interface I1\n{\n \" + (binaryIsAbstract ? \"abstract \" : \"\") + @\"static I1 operator\" + op + @\" (I1 x, I1 y)\" + (binaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (trueIsAbstract ? \"abstract \" : \"\") + @\"static bool operator true (I1 x)\" + (trueIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (falseIsAbstract ? \"abstract \" : \"\") + @\"static bool operator false (I1 x)\" + (falseIsAbstract ? \";\" : \" => throw null;\") + @\"\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, T y) where T : I1\n {\n _ = x \" + op + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n if (success)\n {\n compilation2.VerifyDiagnostics();\n }\n else\n {\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x && y;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + op + \" y\").WithLocation(6, 13)\n );\n }\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n var builder = ArrayBuilder<DiagnosticDescription>.GetInstance();\n\n if (binaryIsAbstract)\n {\n builder.Add(\n // (12,32): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator& (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(12, 32)\n );\n }\n\n if (trueIsAbstract)\n {\n builder.Add(\n // (13,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"true\").WithLocation(13, 35)\n );\n }\n\n if (falseIsAbstract)\n {\n builder.Add(\n // (14,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"false\").WithLocation(14, 35)\n );\n }\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_RuntimeDoesNotSupportDefaultInterfaceImplementation).Verify(builder.ToArrayAndFree());\n }\n\n [Theory]\n [InlineData(\"+\")]\n [InlineData(\"-\")]\n [InlineData(\"*\")]\n [InlineData(\"/\")]\n [InlineData(\"%\")]\n [InlineData(\"&\")]\n [InlineData(\"|\")]\n [InlineData(\"^\")]\n [InlineData(\"<<\")]\n [InlineData(\">>\")]\n public void ConsumeAbstractCompoundBinaryOperator_04(string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator\" + op + @\" (T x, int y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, int y) where T : I1<T>\n {\n x \" + op + @\"= y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // x *= y;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + \"= y\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static T operator* (T x, int y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(12, 31)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperatorForTupleEquality_04([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static bool operator == (T x, T y);\n abstract static bool operator != (T x, T y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, T) x) where T : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + \" x\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator == (T x, T y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"==\").WithLocation(12, 35),\n // (13,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static bool operator != (T x, T y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"!=\").WithLocation(13, 35)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperator_06([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator\" + op + @\" (I1 x, int y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, int y) where T : I1\n {\n _ = x \" + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x - y;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + \" y\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (12,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator- (I1 x, int y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 32)\n );\n }\n\n [Theory]\n [InlineData(\"&\", true, false, false, false)]\n [InlineData(\"|\", true, false, false, false)]\n [InlineData(\"&\", false, false, true, false)]\n [InlineData(\"|\", false, true, false, false)]\n [InlineData(\"&\", true, false, true, false)]\n [InlineData(\"|\", true, true, false, false)]\n [InlineData(\"&\", false, true, false, true)]\n [InlineData(\"|\", false, false, true, true)]\n public void ConsumeAbstractLogicalBinaryOperator_06(string op, bool binaryIsAbstract, bool trueIsAbstract, bool falseIsAbstract, bool success)\n {\n var source1 =\n@\"\npublic interface I1\n{\n \" + (binaryIsAbstract ? \"abstract \" : \"\") + @\"static I1 operator\" + op + @\" (I1 x, I1 y)\" + (binaryIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (trueIsAbstract ? \"abstract \" : \"\") + @\"static bool operator true (I1 x)\" + (trueIsAbstract ? \";\" : \" => throw null;\") + @\"\n \" + (falseIsAbstract ? \"abstract \" : \"\") + @\"static bool operator false (I1 x)\" + (falseIsAbstract ? \";\" : \" => throw null;\") + @\"\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, T y) where T : I1\n {\n _ = x \" + op + op + @\" y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n if (success)\n {\n compilation2.VerifyDiagnostics();\n }\n else\n {\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x && y;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + op + \" y\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n }\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n var builder = ArrayBuilder<DiagnosticDescription>.GetInstance();\n\n if (binaryIsAbstract)\n {\n builder.Add(\n // (12,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator& (I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 32)\n );\n }\n\n if (trueIsAbstract)\n {\n builder.Add(\n // (13,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator true (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"true\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(13, 35)\n );\n }\n\n if (falseIsAbstract)\n {\n builder.Add(\n // (14,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator false (I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"false\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(14, 35)\n );\n }\n\n compilation3.VerifyDiagnostics(builder.ToArrayAndFree());\n }\n\n [Theory]\n [InlineData(\"+\")]\n [InlineData(\"-\")]\n [InlineData(\"*\")]\n [InlineData(\"/\")]\n [InlineData(\"%\")]\n [InlineData(\"&\")]\n [InlineData(\"|\")]\n [InlineData(\"^\")]\n [InlineData(\"<<\")]\n [InlineData(\">>\")]\n public void ConsumeAbstractCompoundBinaryOperator_06(string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator\" + op + @\" (T x, int y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>(T x, int y) where T : I1<T>\n {\n x \" + op + @\"= y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // x <<= y;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + \"= y\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static T operator<< (T x, int y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 31)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractBinaryOperatorForTupleEquality_06([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static bool operator == (T x, T y);\n abstract static bool operator != (T x, T y);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, T) x) where T : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + \" x\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (12,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator == (T x, T y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"==\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 35),\n // (13,35): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static bool operator != (T x, T y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"!=\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(13, 35)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyGet_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set;}\n\n static void M02()\n {\n _ = P01;\n _ = P04;\n }\n\n void M03()\n {\n _ = this.P01;\n _ = this.P04;\n }\n\n static int P04 { get; set; }\n\n protected abstract static int P05 { get; set; }\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = I1.P01;\n _ = x.P01;\n _ = I1.P04;\n _ = x.P04;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = T.P03;\n _ = T.P04;\n _ = T.P00;\n _ = T.P05;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01.ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = P01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01\").WithLocation(8, 13),\n // (14,13): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = this.P01;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 13),\n // (15,13): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = this.P04;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 13),\n // (27,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = I1.P01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01\").WithLocation(27, 13),\n // (28,13): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = x.P01;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 13),\n // (30,13): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = x.P04;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 13),\n // (35,13): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = T.P03;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 13),\n // (36,13): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = T.P04;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 13),\n // (37,13): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = T.P00;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 13),\n // (38,15): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // _ = T.P05;\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 15),\n // (40,71): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01.ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.P01\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertySet_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set;}\n\n static void M02()\n {\n P01 = 1;\n P04 = 1;\n }\n\n void M03()\n {\n this.P01 = 1;\n this.P04 = 1;\n }\n\n static int P04 { get; set; }\n\n protected abstract static int P05 { get; set; }\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n I1.P01 = 1;\n x.P01 = 1;\n I1.P04 = 1;\n x.P04 = 1;\n }\n\n static void MT2<T>() where T : I1\n {\n T.P03 = 1;\n T.P04 = 1;\n T.P00 = 1;\n T.P05 = 1;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 = 1);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // P01 = 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01\").WithLocation(8, 9),\n // (14,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P01 = 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 9),\n // (15,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P04 = 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.P01 = 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01\").WithLocation(27, 9),\n // (28,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P01 = 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 9),\n // (30,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P04 = 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 9),\n // (35,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P03 = 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 9),\n // (36,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P04 = 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 9),\n // (37,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P00 = 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 9),\n // (38,11): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // T.P05 = 1;\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 11),\n // (40,71): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 = 1);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, \"T.P01 = 1\").WithLocation(40, 71),\n // (40,71): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 = 1);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.P01\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyCompound_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set;}\n\n static void M02()\n {\n P01 += 1;\n P04 += 1;\n }\n\n void M03()\n {\n this.P01 += 1;\n this.P04 += 1;\n }\n\n static int P04 { get; set; }\n\n protected abstract static int P05 { get; set; }\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n I1.P01 += 1;\n x.P01 += 1;\n I1.P04 += 1;\n x.P04 += 1;\n }\n\n static void MT2<T>() where T : I1\n {\n T.P03 += 1;\n T.P04 += 1;\n T.P00 += 1;\n T.P05 += 1;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 += 1);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // P01 += 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01\").WithLocation(8, 9),\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // P01 += 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01\").WithLocation(8, 9),\n // (14,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P01 += 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 9),\n // (15,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P04 += 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.P01 += 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01\").WithLocation(27, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.P01 += 1;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01\").WithLocation(27, 9),\n // (28,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P01 += 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 9),\n // (30,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P04 += 1;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 9),\n // (35,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P03 += 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 9),\n // (36,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P04 += 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 9),\n // (37,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P00 += 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 9),\n // (38,11): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // T.P05 += 1;\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 11),\n // (40,71): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 += 1);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, \"T.P01 += 1\").WithLocation(40, 71),\n // (40,71): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 += 1);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.P01\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticProperty_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static int P01 { get; set; }\n\n static void M02()\n {\n _ = nameof(P01);\n _ = nameof(P04);\n }\n\n void M03()\n {\n _ = nameof(this.P01);\n _ = nameof(this.P04);\n }\n\n static int P04 { get; set; }\n\n protected abstract static int P05 { get; set; }\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = nameof(I1.P01);\n _ = nameof(x.P01);\n _ = nameof(I1.P04);\n _ = nameof(x.P04);\n }\n\n static void MT2<T>() where T : I1\n {\n _ = nameof(T.P03);\n _ = nameof(T.P04);\n _ = nameof(T.P00);\n _ = nameof(T.P05);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (14,20): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(this.P01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 20),\n // (15,20): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(this.P04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 20),\n // (28,20): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(x.P01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 20),\n // (30,20): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(x.P04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 20),\n // (35,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P03);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 20),\n // (36,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P04);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 20),\n // (37,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P00);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 20),\n // (38,22): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // _ = nameof(T.P05);\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 22)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyGet_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\nclass Test\n{\n static void M02<T, U>() where T : U where U : I1\n {\n _ = T.P01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 14 (0xe)\n .maxstack 1\n IL_0000: nop\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"int I1.P01.get\"\"\n IL_000c: pop\n IL_000d: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: constrained. \"\"T\"\"\n IL_0006: call \"\"int I1.P01.get\"\"\n IL_000b: pop\n IL_000c: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>().First().Right;\n\n Assert.Equal(\"T.P01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIPropertyReferenceOperation: System.Int32 I1.P01 { get; set; } (Static) (OperationKind.PropertyReference, Type: System.Int32) (Syntax: 'T.P01')\n Instance Receiver: \n null\n\");\n\n var m02 = compilation1.GetMember<MethodSymbol>(\"Test.M02\");\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n\n Assert.Contains(\"P01\", model.LookupNames(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()));\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertySet_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\nclass Test\n{\n static void M02<T, U>() where T : U where U : I1\n {\n T.P01 = 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 15 (0xf)\n .maxstack 1\n IL_0000: nop\n IL_0001: ldc.i4.1\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"void I1.P01.set\"\"\n IL_000d: nop\n IL_000e: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: ldc.i4.1\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"void I1.P01.set\"\"\n IL_000c: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>().First().Left;\n\n Assert.Equal(\"T.P01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIPropertyReferenceOperation: System.Int32 I1.P01 { get; set; } (Static) (OperationKind.PropertyReference, Type: System.Int32) (Syntax: 'T.P01')\n Instance Receiver: \n null\n\");\n\n var m02 = compilation1.GetMember<MethodSymbol>(\"Test.M02\");\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n\n Assert.Contains(\"P01\", model.LookupNames(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()));\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyCompound_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\nclass Test\n{\n static void M02<T, U>() where T : U where U : I1\n {\n T.P01 += 1;\n }\n\n static string M03<T, U>() where T : U where U : I1\n {\n return nameof(T.P01);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 27 (0x1b)\n .maxstack 2\n IL_0000: nop\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"int I1.P01.get\"\"\n IL_000c: ldc.i4.1\n IL_000d: add\n IL_000e: constrained. \"\"T\"\"\n IL_0014: call \"\"void I1.P01.set\"\"\n IL_0019: nop\n IL_001a: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 11 (0xb)\n .maxstack 1\n .locals init (string V_0)\n IL_0000: nop\n IL_0001: ldstr \"\"P01\"\"\n IL_0006: stloc.0\n IL_0007: br.s IL_0009\n IL_0009: ldloc.0\n IL_000a: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 25 (0x19)\n .maxstack 2\n IL_0000: constrained. \"\"T\"\"\n IL_0006: call \"\"int I1.P01.get\"\"\n IL_000b: ldc.i4.1\n IL_000c: add\n IL_000d: constrained. \"\"T\"\"\n IL_0013: call \"\"void I1.P01.set\"\"\n IL_0018: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 1\n IL_0000: ldstr \"\"P01\"\"\n IL_0005: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>().First().Left;\n\n Assert.Equal(\"T.P01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIPropertyReferenceOperation: System.Int32 I1.P01 { get; set; } (Static) (OperationKind.PropertyReference, Type: System.Int32) (Syntax: 'T.P01')\n Instance Receiver: \n null\n\");\n\n var m02 = compilation1.GetMember<MethodSymbol>(\"Test.M02\");\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0], \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Equal(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"P01\").Single().ToTestDisplayString());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n Assert.Contains(\"System.Int32 I1.P01 { get; set; }\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n\n Assert.Contains(\"P01\", model.LookupNames(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()));\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyGet_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = T.P01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = T.P01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(12, 31),\n // (12,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(12, 36)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertySet_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 = 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.P01 = 1;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(12, 31),\n // (12,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(12, 36)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyCompound_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 += 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.P01 += 1;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01\").WithLocation(6, 9),\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.P01 += 1;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(12, 31),\n // (12,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(12, 36)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyGet_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = T.P01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = T.P01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = T.P01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13),\n // (12,25): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"P01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 25)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertySet_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 = 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 = 1;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 = 1;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9),\n // (12,25): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"P01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 25)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticPropertyCompound_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int P01 { get; set; }\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 += 1;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 += 1;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 += 1;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9),\n // (12,25): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static int P01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"P01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 25)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventAdd_01()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\ninterface I1\n{\n abstract static event System.Action P01;\n\n static void M02()\n {\n P01 += null;\n P04 += null;\n }\n\n void M03()\n {\n this.P01 += null;\n this.P04 += null;\n }\n\n static event System.Action P04;\n\n protected abstract static event System.Action P05;\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n I1.P01 += null;\n x.P01 += null;\n I1.P04 += null;\n x.P04 += null;\n }\n\n static void MT2<T>() where T : I1\n {\n T.P03 += null;\n T.P04 += null;\n T.P00 += null;\n T.P05 += null;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 += null);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // P01 += null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01 += null\").WithLocation(8, 9),\n // (14,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P01 += null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 9),\n // (14,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // this.P01 += null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"this.P01 += null\").WithLocation(14, 9),\n // (15,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P04 += null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.P01 += null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01 += null\").WithLocation(27, 9),\n // (28,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P01 += null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 9),\n // (28,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // x.P01 += null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x.P01 += null\").WithLocation(28, 9),\n // (30,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P04 += null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 9),\n // (35,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P03 += null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 9),\n // (36,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P04 += null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 9),\n // (37,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P00 += null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 9),\n // (38,11): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // T.P05 += null;\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 11),\n // (40,71): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 += null);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, \"T.P01 += null\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventRemove_01()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // The event is never used\ninterface I1\n{\n abstract static event System.Action P01;\n\n static void M02()\n {\n P01 -= null;\n P04 -= null;\n }\n\n void M03()\n {\n this.P01 -= null;\n this.P04 -= null;\n }\n\n static event System.Action P04;\n\n protected abstract static event System.Action P05;\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n I1.P01 -= null;\n x.P01 -= null;\n I1.P04 -= null;\n x.P04 -= null;\n }\n\n static void MT2<T>() where T : I1\n {\n T.P03 -= null;\n T.P04 -= null;\n T.P00 -= null;\n T.P05 -= null;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 -= null);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // P01 -= null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"P01 -= null\").WithLocation(8, 9),\n // (14,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P01 -= null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 9),\n // (14,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // this.P01 -= null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"this.P01 -= null\").WithLocation(14, 9),\n // (15,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // this.P04 -= null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 9),\n // (27,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // I1.P01 -= null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.P01 -= null\").WithLocation(27, 9),\n // (28,9): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P01 -= null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 9),\n // (28,9): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // x.P01 -= null;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"x.P01 -= null\").WithLocation(28, 9),\n // (30,9): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // x.P04 -= null;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 9),\n // (35,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P03 -= null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 9),\n // (36,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P04 -= null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 9),\n // (37,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.P00 -= null;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 9),\n // (38,11): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // T.P05 -= null;\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 11),\n // (40,71): error CS0832: An expression tree may not contain an assignment operator\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => T.P01 -= null);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAssignment, \"T.P01 -= null\").WithLocation(40, 71)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEvent_02()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static event System.Action P01;\n\n static void M02()\n {\n _ = nameof(P01);\n _ = nameof(P04);\n }\n\n void M03()\n {\n _ = nameof(this.P01);\n _ = nameof(this.P04);\n }\n\n static event System.Action P04;\n\n protected abstract static event System.Action P05;\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = nameof(I1.P01);\n _ = nameof(x.P01);\n _ = nameof(I1.P04);\n _ = nameof(x.P04);\n }\n\n static void MT2<T>() where T : I1\n {\n _ = nameof(T.P03);\n _ = nameof(T.P04);\n _ = nameof(T.P00);\n _ = nameof(T.P05);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (14,20): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(this.P01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P01\").WithArguments(\"I1.P01\").WithLocation(14, 20),\n // (15,20): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(this.P04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.P04\").WithArguments(\"I1.P04\").WithLocation(15, 20),\n // (28,20): error CS0176: Member 'I1.P01' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(x.P01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P01\").WithArguments(\"I1.P01\").WithLocation(28, 20),\n // (30,20): error CS0176: Member 'I1.P04' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = nameof(x.P04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.P04\").WithArguments(\"I1.P04\").WithLocation(30, 20),\n // (35,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P03);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 20),\n // (36,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P04);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 20),\n // (37,20): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = nameof(T.P00);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 20),\n // (38,22): error CS0122: 'I1.P05' is inaccessible due to its protection level\n // _ = nameof(T.P05);\n Diagnostic(ErrorCode.ERR_BadAccess, \"P05\").WithArguments(\"I1.P05\").WithLocation(38, 22)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEvent_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action E01;\n}\n\nclass Test\n{\n static void M02<T, U>() where T : U where U : I1\n {\n T.E01 += null;\n T.E01 -= null;\n }\n\n static string M03<T, U>() where T : U where U : I1\n {\n return nameof(T.E01);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 28 (0x1c)\n .maxstack 1\n IL_0000: nop\n IL_0001: ldnull\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"void I1.E01.add\"\"\n IL_000d: nop\n IL_000e: ldnull\n IL_000f: constrained. \"\"T\"\"\n IL_0015: call \"\"void I1.E01.remove\"\"\n IL_001a: nop\n IL_001b: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 11 (0xb)\n .maxstack 1\n .locals init (string V_0)\n IL_0000: nop\n IL_0001: ldstr \"\"E01\"\"\n IL_0006: stloc.0\n IL_0007: br.s IL_0009\n IL_0009: ldloc.0\n IL_000a: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 25 (0x19)\n .maxstack 1\n IL_0000: ldnull\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"void I1.E01.add\"\"\n IL_000c: ldnull\n IL_000d: constrained. \"\"T\"\"\n IL_0013: call \"\"void I1.E01.remove\"\"\n IL_0018: ret\n}\n\");\n\n verifier.VerifyIL(\"Test.M03<T, U>()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 1\n IL_0000: ldstr \"\"E01\"\"\n IL_0005: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>().First().Left;\n\n Assert.Equal(\"T.E01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIEventReferenceOperation: event System.Action I1.E01 (Static) (OperationKind.EventReference, Type: System.Action) (Syntax: 'T.E01')\n Instance Receiver: \n null\n\");\n\n var m02 = compilation1.GetMember<MethodSymbol>(\"Test.M02\");\n\n Assert.Equal(\"event System.Action I1.E01\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0], \"E01\").Single().ToTestDisplayString());\n Assert.Equal(\"event System.Action I1.E01\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0], \"E01\").Single().ToTestDisplayString());\n Assert.Contains(\"event System.Action I1.E01\", ((CSharpSemanticModel)model).LookupSymbols(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n Assert.Contains(\"event System.Action I1.E01\", ((CSharpSemanticModel)model).LookupStaticMembers(node.SpanStart, m02.TypeParameters[0]).ToTestDisplayStrings());\n\n Assert.Equal(\"event System.Action I1.E01\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"E01\").Single().ToTestDisplayString());\n Assert.Equal(\"event System.Action I1.E01\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol(), \"E01\").Single().ToTestDisplayString());\n Assert.Contains(\"event System.Action I1.E01\", model.LookupSymbols(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n Assert.Contains(\"event System.Action I1.E01\", model.LookupStaticMembers(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()).ToTestDisplayStrings());\n\n Assert.Contains(\"E01\", model.LookupNames(node.SpanStart, m02.TypeParameters[0].GetPublicSymbol()));\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventAdd_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action P01;\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 += null;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.P01 += null;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01 += null\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,41): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static event System.Action P01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"P01\").WithLocation(12, 41)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventRemove_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action P01;\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 -= null;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // T.P01 -= null;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.P01 -= null\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,41): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static event System.Action P01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"P01\").WithLocation(12, 41)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventAdd_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action P01;\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 += null;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 += null;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 += null;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9),\n // (12,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event System.Action P01;\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"P01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 41)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticEventRemove_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action P01;\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.P01 -= null;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 -= null;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,9): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // T.P01 -= null;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 9),\n // (12,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event System.Action P01;\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"P01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 41)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticIndexedProperty_03()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .custom instance void [mscorlib]System.Reflection.DefaultMemberAttribute::.ctor(string) = (\n 01 00 04 49 74 65 6d 00 00\n )\n\n // Methods\n .method public hidebysig specialname newslot abstract virtual \n static int32 get_Item (\n int32 x\n ) cil managed \n {\n } // end of method I1::get_Item\n\n .method public hidebysig specialname newslot abstract virtual \n static void set_Item (\n int32 x,\n int32 'value'\n ) cil managed \n {\n } // end of method I1::set_Item\n\n // Properties\n .property int32 Item(\n int32 x\n )\n {\n .get int32 I1::get_Item(int32)\n .set void I1::set_Item(int32, int32)\n }\n\n} // end of class I1\n\";\n\n var source1 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.Item[0] += 1;\n }\n\n static string M03<T>() where T : I1\n {\n return nameof(T.Item);\n }\n}\n\";\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (6,9): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // T.Item[0] += 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(6, 9),\n // (11,23): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // return nameof(T.Item);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(11, 23)\n );\n\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T[0] += 1;\n }\n\n static void M03<T>() where T : I1\n {\n T.set_Item(0, T.get_Item(0) + 1);\n }\n}\n\";\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (6,9): error CS0119: 'T' is a type, which is not valid in the given context\n // T[0] += 1;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type\").WithLocation(6, 9),\n // (11,11): error CS0571: 'I1.this[int].set': cannot explicitly call operator or accessor\n // T.set_Item(0, T.get_Item(0) + 1);\n Diagnostic(ErrorCode.ERR_CantCallSpecialMethod, \"set_Item\").WithArguments(\"I1.this[int].set\").WithLocation(11, 11),\n // (11,25): error CS0571: 'I1.this[int].get': cannot explicitly call operator or accessor\n // T.set_Item(0, T.get_Item(0) + 1);\n Diagnostic(ErrorCode.ERR_CantCallSpecialMethod, \"get_Item\").WithArguments(\"I1.this[int].get\").WithLocation(11, 25)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticIndexedProperty_04()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n // Methods\n .method public hidebysig specialname newslot abstract virtual \n static int32 get_Item (\n int32 x\n ) cil managed \n {\n } // end of method I1::get_Item\n\n .method public hidebysig specialname newslot abstract virtual \n static void set_Item (\n int32 x,\n int32 'value'\n ) cil managed \n {\n } // end of method I1::set_Item\n\n // Properties\n .property int32 Item(\n int32 x\n )\n {\n .get int32 I1::get_Item(int32)\n .set void I1::set_Item(int32, int32)\n }\n\n} // end of class I1\n\";\n\n var source1 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.Item[0] += 1;\n }\n\n static string M03<T>() where T : I1\n {\n return nameof(T.Item);\n }\n}\n\";\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (6,11): error CS1545: Property, indexer, or event 'I1.Item[int]' is not supported by the language; try directly calling accessor methods 'I1.get_Item(int)' or 'I1.set_Item(int, int)'\n // T.Item[0] += 1;\n Diagnostic(ErrorCode.ERR_BindToBogusProp2, \"Item\").WithArguments(\"I1.Item[int]\", \"I1.get_Item(int)\", \"I1.set_Item(int, int)\").WithLocation(6, 11),\n // (11,25): error CS1545: Property, indexer, or event 'I1.Item[int]' is not supported by the language; try directly calling accessor methods 'I1.get_Item(int)' or 'I1.set_Item(int, int)'\n // return nameof(T.Item);\n Diagnostic(ErrorCode.ERR_BindToBogusProp2, \"Item\").WithArguments(\"I1.Item[int]\", \"I1.get_Item(int)\", \"I1.set_Item(int, int)\").WithLocation(11, 25)\n );\n\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n T.set_Item(0, T.get_Item(0) + 1);\n }\n}\n\";\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation2, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T>()\",\n@\"\n{\n // Code size 29 (0x1d)\n .maxstack 3\n IL_0000: nop\n IL_0001: ldc.i4.0\n IL_0002: ldc.i4.0\n IL_0003: constrained. \"\"T\"\"\n IL_0009: call \"\"int I1.get_Item(int)\"\"\n IL_000e: ldc.i4.1\n IL_000f: add\n IL_0010: constrained. \"\"T\"\"\n IL_0016: call \"\"void I1.set_Item(int, int)\"\"\n IL_001b: nop\n IL_001c: ret\n}\n\");\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToDelegate_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n\n static void M02()\n {\n _ = (System.Action)M01;\n _ = (System.Action)M04;\n }\n\n void M03()\n {\n _ = (System.Action)this.M01;\n _ = (System.Action)this.M04;\n }\n\n static void M04() {}\n\n protected abstract static void M05();\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = (System.Action)I1.M01;\n _ = (System.Action)x.M01;\n _ = (System.Action)I1.M04;\n _ = (System.Action)x.M04;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Action)T.M03;\n _ = (System.Action)T.M04;\n _ = (System.Action)T.M00;\n _ = (System.Action)T.M05;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => ((System.Action)T.M01).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = (System.Action)M01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"(System.Action)M01\").WithLocation(8, 13),\n // (14,28): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = (System.Action)this.M01;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M01\").WithArguments(\"I1.M01()\").WithLocation(14, 28),\n // (15,28): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = (System.Action)this.M04;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M04\").WithArguments(\"I1.M04()\").WithLocation(15, 28),\n // (27,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = (System.Action)I1.M01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"(System.Action)I1.M01\").WithLocation(27, 13),\n // (28,28): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = (System.Action)x.M01;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M01\").WithArguments(\"I1.M01()\").WithLocation(28, 28),\n // (30,28): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = (System.Action)x.M04;\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M04\").WithArguments(\"I1.M04()\").WithLocation(30, 28),\n // (35,28): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (System.Action)T.M03;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 28),\n // (36,28): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (System.Action)T.M04;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 28),\n // (37,28): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (System.Action)T.M00;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 28),\n // (38,30): error CS0122: 'I1.M05()' is inaccessible due to its protection level\n // _ = (System.Action)T.M05;\n Diagnostic(ErrorCode.ERR_BadAccess, \"M05\").WithArguments(\"I1.M05()\").WithLocation(38, 30),\n // (40,87): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => ((System.Action)T.M01).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.M01\").WithLocation(40, 87)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToDelegate_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\nclass Test\n{\n static System.Action M02<T, U>() where T : U where U : I1\n {\n return T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 24 (0x18)\n .maxstack 2\n .locals init (System.Action V_0)\n IL_0000: nop\n IL_0001: ldnull\n IL_0002: constrained. \"\"T\"\"\n IL_0008: ldftn \"\"void I1.M01()\"\"\n IL_000e: newobj \"\"System.Action..ctor(object, System.IntPtr)\"\"\n IL_0013: stloc.0\n IL_0014: br.s IL_0016\n IL_0016: ldloc.0\n IL_0017: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 19 (0x13)\n .maxstack 2\n IL_0000: ldnull\n IL_0001: constrained. \"\"T\"\"\n IL_0007: ldftn \"\"void I1.M01()\"\"\n IL_000d: newobj \"\"System.Action..ctor(object, System.IntPtr)\"\"\n IL_0012: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<MemberAccessExpressionSyntax>().First();\n\n Assert.Equal(\"T.M01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIMethodReferenceOperation: void I1.M01() (IsVirtual) (Static) (OperationKind.MethodReference, Type: null) (Syntax: 'T.M01')\n Instance Receiver: \n null\n\");\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToDelegate_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = (System.Action)T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = (System.Action)T.M01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"(System.Action)T.M01\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToDelegate_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = (System.Action)T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,28): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = (System.Action)T.M01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 28)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,28): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = (System.Action)T.M01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 28),\n // (12,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_DelegateCreation_01()\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static void M01();\n\n static void M02()\n {\n _ = new System.Action(M01);\n _ = new System.Action(M04);\n }\n\n void M03()\n {\n _ = new System.Action(this.M01);\n _ = new System.Action(this.M04);\n }\n\n static void M04() {}\n\n protected abstract static void M05();\n}\n\nclass Test\n{\n static void MT1(I1 x)\n {\n _ = new System.Action(I1.M01);\n _ = new System.Action(x.M01);\n _ = new System.Action(I1.M04);\n _ = new System.Action(x.M04);\n }\n\n static void MT2<T>() where T : I1\n {\n _ = new System.Action(T.M03);\n _ = new System.Action(T.M04);\n _ = new System.Action(T.M00);\n _ = new System.Action(T.M05);\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => new System.Action(T.M01).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,31): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = new System.Action(M01);\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"M01\").WithLocation(8, 31),\n // (14,31): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = new System.Action(this.M01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M01\").WithArguments(\"I1.M01()\").WithLocation(14, 31),\n // (15,31): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = new System.Action(this.M04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"this.M04\").WithArguments(\"I1.M04()\").WithLocation(15, 31),\n // (27,31): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = new System.Action(I1.M01);\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"I1.M01\").WithLocation(27, 31),\n // (28,31): error CS0176: Member 'I1.M01()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = new System.Action(x.M01);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M01\").WithArguments(\"I1.M01()\").WithLocation(28, 31),\n // (30,31): error CS0176: Member 'I1.M04()' cannot be accessed with an instance reference; qualify it with a type name instead\n // _ = new System.Action(x.M04);\n Diagnostic(ErrorCode.ERR_ObjectProhibited, \"x.M04\").WithArguments(\"I1.M04()\").WithLocation(30, 31),\n // (35,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = new System.Action(T.M03);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 31),\n // (36,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = new System.Action(T.M04);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 31),\n // (37,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = new System.Action(T.M00);\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 31),\n // (38,33): error CS0122: 'I1.M05()' is inaccessible due to its protection level\n // _ = new System.Action(T.M05);\n Diagnostic(ErrorCode.ERR_BadAccess, \"M05\").WithArguments(\"I1.M05()\").WithLocation(38, 33),\n // (40,89): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => new System.Action(T.M01).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, \"T.M01\").WithLocation(40, 89)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_DelegateCreation_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\nclass Test\n{\n static System.Action M02<T, U>() where T : U where U : I1\n {\n return new System.Action(T.M01);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 24 (0x18)\n .maxstack 2\n .locals init (System.Action V_0)\n IL_0000: nop\n IL_0001: ldnull\n IL_0002: constrained. \"\"T\"\"\n IL_0008: ldftn \"\"void I1.M01()\"\"\n IL_000e: newobj \"\"System.Action..ctor(object, System.IntPtr)\"\"\n IL_0013: stloc.0\n IL_0014: br.s IL_0016\n IL_0016: ldloc.0\n IL_0017: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 19 (0x13)\n .maxstack 2\n IL_0000: ldnull\n IL_0001: constrained. \"\"T\"\"\n IL_0007: ldftn \"\"void I1.M01()\"\"\n IL_000d: newobj \"\"System.Action..ctor(object, System.IntPtr)\"\"\n IL_0012: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<MemberAccessExpressionSyntax>().First();\n\n Assert.Equal(\"T.M01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIMethodReferenceOperation: void I1.M01() (IsVirtual) (Static) (OperationKind.MethodReference, Type: null) (Syntax: 'T.M01')\n Instance Receiver: \n null\n\");\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_DelegateCreation_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = new System.Action(T.M01);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = new System.Action(T.M01);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"T.M01\").WithLocation(6, 31)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_DelegateCreation_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>() where T : I1\n {\n _ = new System.Action(T.M01);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,31): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = new System.Action(T.M01);\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 31)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,31): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = new System.Action(T.M01);\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 31),\n // (12,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToFunctionPointer_01()\n {\n var source1 =\n@\"\nunsafe interface I1\n{\n abstract static void M01();\n\n static void M02()\n {\n _ = (delegate*<void>)&M01;\n _ = (delegate*<void>)&M04;\n }\n\n void M03()\n {\n _ = (delegate*<void>)&this.M01;\n _ = (delegate*<void>)&this.M04;\n }\n\n static void M04() {}\n\n protected abstract static void M05();\n}\n\nunsafe class Test\n{\n static void MT1(I1 x)\n {\n _ = (delegate*<void>)&I1.M01;\n _ = (delegate*<void>)&x.M01;\n _ = (delegate*<void>)&I1.M04;\n _ = (delegate*<void>)&x.M04;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (delegate*<void>)&T.M03;\n _ = (delegate*<void>)&T.M04;\n _ = (delegate*<void>)&T.M00;\n _ = (delegate*<void>)&T.M05;\n\n _ = (System.Linq.Expressions.Expression<System.Action>)(() => ((System.IntPtr)((delegate*<void>)&T.M01)).ToString());\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = (delegate*<void>)&M01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"(delegate*<void>)&M01\").WithLocation(8, 13),\n // (14,13): error CS8757: No overload for 'M01' matches function pointer 'delegate*<void>'\n // _ = (delegate*<void>)&this.M01;\n Diagnostic(ErrorCode.ERR_MethFuncPtrMismatch, \"(delegate*<void>)&this.M01\").WithArguments(\"M01\", \"delegate*<void>\").WithLocation(14, 13),\n // (15,13): error CS8757: No overload for 'M04' matches function pointer 'delegate*<void>'\n // _ = (delegate*<void>)&this.M04;\n Diagnostic(ErrorCode.ERR_MethFuncPtrMismatch, \"(delegate*<void>)&this.M04\").WithArguments(\"M04\", \"delegate*<void>\").WithLocation(15, 13),\n // (27,13): error CS8926: A static abstract interface member can be accessed only on a type parameter.\n // _ = (delegate*<void>)&I1.M01;\n Diagnostic(ErrorCode.ERR_BadAbstractStaticMemberAccess, \"(delegate*<void>)&I1.M01\").WithLocation(27, 13),\n // (28,13): error CS8757: No overload for 'M01' matches function pointer 'delegate*<void>'\n // _ = (delegate*<void>)&x.M01;\n Diagnostic(ErrorCode.ERR_MethFuncPtrMismatch, \"(delegate*<void>)&x.M01\").WithArguments(\"M01\", \"delegate*<void>\").WithLocation(28, 13),\n // (30,13): error CS8757: No overload for 'M04' matches function pointer 'delegate*<void>'\n // _ = (delegate*<void>)&x.M04;\n Diagnostic(ErrorCode.ERR_MethFuncPtrMismatch, \"(delegate*<void>)&x.M04\").WithArguments(\"M04\", \"delegate*<void>\").WithLocation(30, 13),\n // (35,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (delegate*<void>)&T.M03;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(35, 31),\n // (36,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (delegate*<void>)&T.M04;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(36, 31),\n // (37,31): error CS0119: 'T' is a type parameter, which is not valid in the given context\n // _ = (delegate*<void>)&T.M00;\n Diagnostic(ErrorCode.ERR_BadSKunknown, \"T\").WithArguments(\"T\", \"type parameter\").WithLocation(37, 31),\n // (38,33): error CS0122: 'I1.M05()' is inaccessible due to its protection level\n // _ = (delegate*<void>)&T.M05;\n Diagnostic(ErrorCode.ERR_BadAccess, \"M05\").WithArguments(\"I1.M05()\").WithLocation(38, 33),\n // (40,88): error CS1944: An expression tree may not contain an unsafe pointer operation\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => ((System.IntPtr)((delegate*<void>)&T.M01)).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsPointerOp, \"(delegate*<void>)&T.M01\").WithLocation(40, 88),\n // (40,106): error CS8810: '&' on method groups cannot be used in expression trees\n // _ = (System.Linq.Expressions.Expression<System.Action>)(() => ((System.IntPtr)((delegate*<void>)&T.M01)).ToString());\n Diagnostic(ErrorCode.ERR_AddressOfMethodGroupInExpressionTree, \"T.M01\").WithLocation(40, 106)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToFunctionPointer_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\nunsafe class Test\n{\n static delegate*<void> M02<T, U>() where T : U where U : I1\n {\n return &T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (delegate*<void> V_0)\n IL_0000: nop\n IL_0001: constrained. \"\"T\"\"\n IL_0007: ldftn \"\"void I1.M01()\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>()\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: constrained. \"\"T\"\"\n IL_0006: ldftn \"\"void I1.M01()\"\"\n IL_000c: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<MemberAccessExpressionSyntax>().First();\n\n Assert.Equal(\"T.M01\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" qualifier is important for this invocation, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIMethodReferenceOperation: void I1.M01() (IsVirtual) (Static) (OperationKind.MethodReference, Type: null) (Syntax: 'T.M01')\n Instance Receiver: \n null\n\");\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionFunctionPointer_04()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nunsafe class Test\n{\n static void M02<T>() where T : I1\n {\n _ = (delegate*<void>)&T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = (delegate*<void>)&T.M01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"(delegate*<void>)&T.M01\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (12,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(12, 26)\n );\n }\n\n [Fact]\n public void ConsumeAbstractStaticMethod_ConversionToFunctionPointer_06()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\n@\"\nunsafe class Test\n{\n static void M02<T>() where T : I1\n {\n _ = (delegate*<void>)&T.M01;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,31): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = (delegate*<void>)&T.M01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 31)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (6,31): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = (delegate*<void>)&T.M01;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"T\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 31),\n // (12,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 26)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_01(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public void M01() {}\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n static void M01() {}\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n void I1.M01() {}\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public static int M01() => throw null;\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n static int I1.M01() => throw null;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01()'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01()\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1.M01()'. 'C2.M01()' cannot implement the interface member because it is not static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1\").WithArguments(\"C2\", \"I1.M01()\", \"C2.M01()\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01()'. 'C3.M01()' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01()\", \"C3.M01()\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01()'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01()\").WithLocation(24, 10),\n // (26,13): error CS0539: 'C4.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01()\").WithLocation(26, 13),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01()'. 'C5.M01()' cannot implement 'I1.M01()' because it does not have the matching return type of 'void'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01()\", \"C5.M01()\", \"void\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01()'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01()\").WithLocation(36, 10),\n // (38,19): error CS0539: 'C6.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1.M01() => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01()\").WithLocation(38, 19)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_02(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract void M01();\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public static void M01() {}\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n void M01() {}\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n static void I1.M01() {}\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public int M01() => throw null;\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n int I1.M01() => throw null;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01()'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01()\").WithLocation(8, 10),\n // (12,10): error CS0736: 'C2' does not implement instance interface member 'I1.M01()'. 'C2.M01()' cannot implement the interface member because it is static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberStatic, \"I1\").WithArguments(\"C2\", \"I1.M01()\", \"C2.M01()\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01()'. 'C3.M01()' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01()\", \"C3.M01()\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01()'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01()\").WithLocation(24, 10),\n // (26,20): error CS0539: 'C4.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01()\").WithLocation(26, 20),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01()'. 'C5.M01()' cannot implement 'I1.M01()' because it does not have the matching return type of 'void'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01()\", \"C5.M01()\", \"void\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01()'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01()\").WithLocation(36, 10),\n // (38,12): error CS0539: 'C6.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // int I1.M01() => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01()\").WithLocation(38, 12)\n );\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\ninterface I2 : I1\n{}\n\ninterface I3 : I1\n{\n public virtual void M01() {}\n}\n\ninterface I4 : I1\n{\n static void M01() {}\n}\n\ninterface I5 : I1\n{\n void I1.M01() {}\n}\n\ninterface I6 : I1\n{\n static void I1.M01() {}\n}\n\ninterface I7 : I1\n{\n abstract static void M01();\n}\n\ninterface I8 : I1\n{\n abstract static void I1.M01();\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (12,25): warning CS0108: 'I3.M01()' hides inherited member 'I1.M01()'. Use the new keyword if hiding was intended.\n // public virtual void M01() {}\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I3.M01()\", \"I1.M01()\").WithLocation(12, 25),\n // (17,17): warning CS0108: 'I4.M01()' hides inherited member 'I1.M01()'. Use the new keyword if hiding was intended.\n // static void M01() {}\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I4.M01()\", \"I1.M01()\").WithLocation(17, 17),\n // (22,13): error CS0539: 'I5.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I5.M01()\").WithLocation(22, 13),\n // (27,20): error CS0106: The modifier 'static' is not valid for this item\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(27, 20),\n // (27,20): error CS0539: 'I6.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I6.M01()\").WithLocation(27, 20),\n // (32,26): warning CS0108: 'I7.M01()' hides inherited member 'I1.M01()'. Use the new keyword if hiding was intended.\n // abstract static void M01();\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I7.M01()\", \"I1.M01()\").WithLocation(32, 26),\n // (37,29): error CS0106: The modifier 'static' is not valid for this item\n // abstract static void I1.M01();\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(37, 29),\n // (37,29): error CS0539: 'I8.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static void I1.M01();\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I8.M01()\").WithLocation(37, 29)\n );\n\n var m01 = compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I8\").FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_04(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n abstract static void M02();\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test: I1\n{\n static void I1.M01() {}\n public static void M02() {}\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,20): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 20)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (4,20): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 20),\n // (10,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(10, 26),\n // (11,26): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static void M02();\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M02\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(11, 26)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_05(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n public static void M01() {}\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01()' cannot implement interface member 'I1.M01()' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01()\", \"I1.M01()\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01()' cannot implement interface member 'I1.M01()' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01()\", \"I1.M01()\", \"Test1\").WithLocation(2, 12),\n // (9,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(9, 26)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_06(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static void I1.M01() {}\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,20): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 20)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (4,20): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 20),\n // (9,26): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static void M01();\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(9, 26)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_07(bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n public static void M01() {}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Ordinary, cM01.MethodKind);\n\n Assert.Equal(\"void C.M01()\", cM01.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_08(bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n static void I1.M01() {}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM01.MethodKind);\n\n Assert.Equal(\"void C.I1.M01()\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_09()\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\npublic class C1\n{\n public static void M01() {}\n}\n\npublic class C2 : C1, I1\n{\n static void I1.M01() {}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var cM01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"void C2.I1.M01()\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_10()\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig static abstract virtual \n void M01 () cil managed \n {\n } // end of method I1::M01\n} // end of class I1\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements I1\n{\n .method private hidebysig \n static void I1.M01 () cil managed \n {\n .override method void I1::M01()\n .maxstack 8\n\n IL_0000: ret\n } // end of method C1::I1.M01\n\n .method public hidebysig static \n void M01 () cil managed \n {\n IL_0000: ret\n } // end of method C1::M01\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: ret\n } // end of method C1::.ctor\n} // end of class C1\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements I1\n{\n .method public hidebysig static \n void M01 () cil managed \n {\n IL_0000: ret\n } // end of method C2::M01\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n } // end of method C2::.ctor\n} // end of class C2\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1\n{\n}\n\npublic class C5 : C2, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"void C1.I1.M01()\", c1M01.ToTestDisplayString());\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n Assert.Equal(\"void C2.M01()\", c5.FindImplementationForInterfaceMember(m01).ToTestDisplayString());\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_11()\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig virtual \n static void M01 () cil managed \n {\n IL_0000: ret\n } // end of method I1::M01\n} // end of class I1\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static void I1.M01() {}\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,19): error CS0539: 'C1.M01()' in explicit interface declaration is not found among members of the interface that can be implemented\n // static void I1.M01() {}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C1.M01()\").WithLocation(4, 19)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_12()\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig abstract virtual \n static void M01 () cil managed \n {\n } // end of method I1::M01\n} // end of class I1\n.class interface public auto ansi abstract I2\n implements I1\n{\n // Methods\n .method private hidebysig \n static void I1.M01 () cil managed \n {\n .override method void I1::M01()\n IL_0000: ret\n } // end of method I2::I1.M01\n} // end of class I2\n\";\n\n var source1 =\n@\"\npublic class C1 : I2\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01()'\n // public class C1 : I2\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2\").WithArguments(\"C1\", \"I1.M01()\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n\n var i2M01 = i2.GetMembers().OfType<MethodSymbol>().Single();\n Assert.Same(m01, i2M01.ExplicitInterfaceImplementations.Single());\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_13()\n {\n // A forwarding method is added for an implicit implementation declared in base class. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\nclass C1\n{\n public static void M01() {}\n}\n\nclass C2 : C1, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n Assert.Equal(\"void C2.I1.M01()\", c2M01.ToTestDisplayString());\n Assert.Same(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n var c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.M01\");\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Ordinary, c1M01.MethodKind);\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.Ordinary, c2M01.MethodKind);\n Assert.Equal(\"void C1.M01()\", c2M01.ToTestDisplayString());\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n }\n }\n\n verifier.VerifyIL(\"C2.I1.M01()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 0\n IL_0000: call \"\"void C1.M01()\"\"\n IL_0005: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_14()\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig abstract virtual \n static void modopt(I1) M01 () cil managed \n {\n } // end of method I1::M01\n} // end of class I1\n\";\n\n var source1 =\n@\"\nclass C1 : I1\n{\n public static void M01() {}\n}\n\nclass C2 : I1\n{\n static void I1.M01() {}\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(\"void modopt(I1) C1.I1.M01()\", c1M01.ToTestDisplayString());\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.M01\");\n Assert.Equal(\"void C1.M01()\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Ordinary, c1M01.MethodKind);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.Ordinary, c1M01.MethodKind);\n Assert.Equal(\"void C1.M01()\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n\n Assert.Equal(\"void modopt(I1) C2.I1.M01()\", c2M01.ToTestDisplayString());\n Assert.Same(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.Same(c2M01, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single());\n }\n\n verifier.VerifyIL(\"C1.I1.M01()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 0\n IL_0000: call \"\"void C1.M01()\"\"\n IL_0005: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_15()\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n abstract static void M02();\n}\n\npublic class C1\n{\n public static void M01() {}\n}\n\npublic class C2 : C1, I1\n{\n static void I1.M02() {}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(\"M01\").OfType<MethodSymbol>().Single();\n\n var c1M01 = c3.BaseType().BaseType().GetMember<MethodSymbol>(\"M01\");\n Assert.Equal(\"void C1.M01()\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n if (c1M01.ContainingModule is PEModuleSymbol)\n {\n var c2M01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C2.I1.M01()\", c2M01.ToTestDisplayString());\n Assert.Same(m01, c2M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n }\n\n var m02 = c3.Interfaces().Single().GetMembers(\"M02\").OfType<MethodSymbol>().Single();\n\n var c2M02 = c3.BaseType().GetMember<MethodSymbol>(\"I1.M02\");\n Assert.Equal(\"void C2.I1.M02()\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticMethod_16()\n {\n // A new implicit implementation is properly considered.\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01();\n}\n\npublic class C1 : I1\n{\n public static void M01() {}\n}\n\npublic class C2 : C1\n{\n new public static void M01() {}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n var verifier = CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"C3.I1.M01()\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 0\n IL_0000: call \"\"void C2.M01()\"\"\n IL_0005: ret\n}\n\");\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n var m01 = c3.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c2M01 = c3.BaseType().GetMember<MethodSymbol>(\"M01\");\n Assert.Equal(\"void C2.M01()\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n if (module is PEModuleSymbol)\n {\n var c3M01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C3.I1.M01()\", c3M01.ToTestDisplayString());\n Assert.Same(m01, c3M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c2M01, c3.FindImplementationForInterfaceMember(m01));\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_17(bool genericFirst)\n {\n // An \"ambiguity\" in implicit implementation declared in generic base class \n\n var generic =\n@\"\n public static void M01(T x) {}\n\";\n var nonGeneric =\n@\"\n public static void M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01(int x);\n}\n\npublic class C1<T> : I1\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.M01(System.Int32 x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.M01(System.Int32 x)\", baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_18(bool genericFirst)\n {\n // An \"ambiguity\" in implicit implementation declared in generic base class plus interface is generic too.\n\n var generic =\n@\"\n public static void M01(T x) {}\n\";\n var nonGeneric =\n@\"\n public static void M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1<T>\n{\n abstract static void M01(T x);\n}\n\npublic class C1<T> : I1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1<int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.M01(T x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.M01(T x)\", baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_19(bool genericFirst)\n {\n // Same as ImplementAbstractStaticMethod_17 only implementation is explicit in source.\n\n var generic =\n@\"\n public static void M01(T x) {}\n\";\n var nonGeneric =\n@\"\n static void I1.M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01(int x);\n}\n\npublic class C1<T> : I1\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.I1.M01(System.Int32 x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_20(bool genericFirst)\n {\n // Same as ImplementAbstractStaticMethod_18 only implementation is explicit in source.\n\n var generic =\n@\"\n static void I1<T>.M01(T x) {}\n\";\n var nonGeneric =\n@\"\n public static void M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1<T>\n{\n abstract static void M01(T x);\n}\n\npublic class C1<T> : I1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1<int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"void C1<T>.I1<T>.M01(T x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_21(bool genericFirst)\n {\n // Same as ImplementAbstractStaticMethod_17 only implicit implementation is in an intermediate base.\n\n var generic =\n@\"\n public static void M01(T x) {}\n\";\n var nonGeneric =\n@\"\n public static void M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1\n{\n abstract static void M01(int x);\n}\n\npublic class C1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\npublic class C11<T> : C1<T>, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C11<int>, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n var expectedDisplay = m01.ContainingModule is PEModuleSymbol ? \"void C11<T>.I1.M01(System.Int32 x)\" : \"void C1<T>.M01(System.Int32 x)\";\n Assert.Equal(expectedDisplay, c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(expectedDisplay, baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticMethod_22(bool genericFirst)\n {\n // Same as ImplementAbstractStaticMethod_18 only implicit implementation is in an intermediate base.\n\n var generic =\n@\"\n public static void M01(T x) {}\n\";\n var nonGeneric =\n@\"\n public static void M01(int x) {}\n\";\n var source1 =\n@\"\npublic interface I1<T>\n{\n abstract static void M01(T x);\n}\n\npublic class C1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\npublic class C11<T> : C1<T>, I1<T>\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C11<int>, I1<int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n var expectedDisplay = m01.ContainingModule is PEModuleSymbol ? \"void C11<T>.I1<T>.M01(T x)\" : \"void C1<T>.M01(T x)\";\n Assert.Equal(expectedDisplay, c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(expectedDisplay, baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n private static string UnaryOperatorName(string op) => OperatorFacts.UnaryOperatorNameFromSyntaxKindIfAny(SyntaxFactory.ParseToken(op).Kind());\n private static string BinaryOperatorName(string op) => op switch { \">>\" => WellKnownMemberNames.RightShiftOperatorName, _ => OperatorFacts.BinaryOperatorNameFromSyntaxKindIfAny(SyntaxFactory.ParseToken(op).Kind()) };\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_01([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n string opName = UnaryOperatorName(op);\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x);\n}\n\n\" + typeKeyword + @\"\n C1 : I1<C1>\n{}\n\n\" + typeKeyword + @\"\n C2 : I1<C2>\n{\n public C2 operator \" + op + @\"(C2 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C3 : I1<C3>\n{\n static C3 operator \" + op + @\"(C3 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C4 : I1<C4>\n{\n C4 I1<C4>.operator \" + op + @\"(C4 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C5 : I1<C5>\n{\n public static int operator \" + op + @\" (C5 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C6 : I1<C6>\n{\n static int I1<C6>.operator \" + op + @\" (C6 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C7 : I1<C7>\n{\n public static C7 \" + opName + @\"(C7 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C8 : I1<C8>\n{\n static C8 I1<C8>.\" + opName + @\"(C8 x) => throw null;\n}\n\npublic interface I2<T> where T : I2<T>\n{\n abstract static T \" + opName + @\"(T x);\n}\n\n\" + typeKeyword + @\"\n C9 : I2<C9>\n{\n public static C9 operator \" + op + @\"(C9 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C10 : I2<C10>\n{\n static C10 I2<C10>.operator \" + op + @\"(C10 x) => throw null;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_BadIncDecRetType or (int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1<C1>.operator +(C1)'\n // C1 : I1<C1>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C1>\").WithArguments(\"C1\", \"I1<C1>.operator \" + op + \"(C1)\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1<C2>.operator +(C2)'. 'C2.operator +(C2)' cannot implement the interface member because it is not static.\n // C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1<C2>\").WithArguments(\"C2\", \"I1<C2>.operator \" + op + \"(C2)\", \"C2.operator \" + op + \"(C2)\").WithLocation(12, 10),\n // (14,24): error CS0558: User-defined operator 'C2.operator +(C2)' must be declared static and public\n // public C2 operator +(C2 x) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"C2.operator \" + op + \"(C2)\").WithLocation(14, 24),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1<C3>.operator +(C3)'. 'C3.operator +(C3)' cannot implement an interface member because it is not public.\n // C3 : I1<C3>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1<C3>\").WithArguments(\"C3\", \"I1<C3>.operator \" + op + \"(C3)\", \"C3.operator \" + op + \"(C3)\").WithLocation(18, 10),\n // (20,24): error CS0558: User-defined operator 'C3.operator +(C3)' must be declared static and public\n // static C3 operator +(C3 x) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"C3.operator \" + op + \"(C3)\").WithLocation(20, 24),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1<C4>.operator +(C4)'\n // C4 : I1<C4>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C4>\").WithArguments(\"C4\", \"I1<C4>.operator \" + op + \"(C4)\").WithLocation(24, 10),\n // (26,24): error CS8930: Explicit implementation of a user-defined operator 'C4.operator +(C4)' must be declared static\n // C4 I1<C4>.operator +(C4 x) => throw null;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, op).WithArguments(\"C4.operator \" + op + \"(C4)\").WithLocation(26, 24),\n // (26,24): error CS0539: 'C4.operator +(C4)' in explicit interface declaration is not found among members of the interface that can be implemented\n // C4 I1<C4>.operator +(C4 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C4.operator \" + op + \"(C4)\").WithLocation(26, 24),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1<C5>.operator +(C5)'. 'C5.operator +(C5)' cannot implement 'I1<C5>.operator +(C5)' because it does not have the matching return type of 'C5'.\n // C5 : I1<C5>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1<C5>\").WithArguments(\"C5\", \"I1<C5>.operator \" + op + \"(C5)\", \"C5.operator \" + op + \"(C5)\", \"C5\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1<C6>.operator +(C6)'\n // C6 : I1<C6>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C6>\").WithArguments(\"C6\", \"I1<C6>.operator \" + op + \"(C6)\").WithLocation(36, 10),\n // (38,32): error CS0539: 'C6.operator +(C6)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1<C6>.operator + (C6 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C6.operator \" + op + \"(C6)\").WithLocation(38, 32),\n // (42,10): error CS0535: 'C7' does not implement interface member 'I1<C7>.operator +(C7)'\n // C7 : I1<C7>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C7>\").WithArguments(\"C7\", \"I1<C7>.operator \" + op + \"(C7)\").WithLocation(42, 10),\n // (48,10): error CS0535: 'C8' does not implement interface member 'I1<C8>.operator +(C8)'\n // C8 : I1<C8>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C8>\").WithArguments(\"C8\", \"I1<C8>.operator \" + op + \"(C8)\").WithLocation(48, 10),\n // (50,22): error CS0539: 'C8.op_UnaryPlus(C8)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static C8 I1<C8>.op_UnaryPlus(C8 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, opName).WithArguments(\"C8.\" + opName + \"(C8)\").WithLocation(50, 22),\n // (59,10): error CS0535: 'C9' does not implement interface member 'I2<C9>.op_UnaryPlus(C9)'\n // C9 : I2<C9>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C9>\").WithArguments(\"C9\", \"I2<C9>.\" + opName + \"(C9)\").WithLocation(59, 10),\n // (65,11): error CS0535: 'C10' does not implement interface member 'I2<C10>.op_UnaryPlus(C10)'\n // C10 : I2<C10>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C10>\").WithArguments(\"C10\", \"I2<C10>.\" + opName + \"(C10)\").WithLocation(65, 11),\n // (67,33): error CS0539: 'C10.operator +(C10)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static C10 I2<C10>.operator +(C10 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C10.operator \" + op + \"(C10)\").WithLocation(67, 33)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_01([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n string opName = BinaryOperatorName(op);\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\n\" + typeKeyword + @\"\n C1 : I1<C1>\n{}\n\n\" + typeKeyword + @\"\n C2 : I1<C2>\n{\n public C2 operator \" + op + @\"(C2 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C3 : I1<C3>\n{\n static C3 operator \" + op + @\"(C3 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C4 : I1<C4>\n{\n C4 I1<C4>.operator \" + op + @\"(C4 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C5 : I1<C5>\n{\n public static int operator \" + op + @\" (C5 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C6 : I1<C6>\n{\n static int I1<C6>.operator \" + op + @\" (C6 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C7 : I1<C7>\n{\n public static C7 \" + opName + @\"(C7 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C8 : I1<C8>\n{\n static C8 I1<C8>.\" + opName + @\"(C8 x, int y) => throw null;\n}\n\npublic interface I2<T> where T : I2<T>\n{\n abstract static T \" + opName + @\"(T x, int y);\n}\n\n\" + typeKeyword + @\"\n C9 : I2<C9>\n{\n public static C9 operator \" + op + @\"(C9 x, int y) => throw null;\n}\n\n\" + typeKeyword + @\"\n C10 : I2<C10>\n{\n static C10 I2<C10>.operator \" + op + @\"(C10 x, int y) => throw null;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.WRN_EqualityOpWithoutEquals or (int)ErrorCode.WRN_EqualityOpWithoutGetHashCode)).Verify(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1<C1>.operator >>(C1, int)'\n // C1 : I1<C1>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C1>\").WithArguments(\"C1\", \"I1<C1>.operator \" + op + \"(C1, int)\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1<C2>.operator >>(C2, int)'. 'C2.operator >>(C2, int)' cannot implement the interface member because it is not static.\n // C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1<C2>\").WithArguments(\"C2\", \"I1<C2>.operator \" + op + \"(C2, int)\", \"C2.operator \" + op + \"(C2, int)\").WithLocation(12, 10),\n // (14,24): error CS0558: User-defined operator 'C2.operator >>(C2, int)' must be declared static and public\n // public C2 operator >>(C2 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"C2.operator \" + op + \"(C2, int)\").WithLocation(14, 24),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1<C3>.operator >>(C3, int)'. 'C3.operator >>(C3, int)' cannot implement an interface member because it is not public.\n // C3 : I1<C3>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1<C3>\").WithArguments(\"C3\", \"I1<C3>.operator \" + op + \"(C3, int)\", \"C3.operator \" + op + \"(C3, int)\").WithLocation(18, 10),\n // (20,24): error CS0558: User-defined operator 'C3.operator >>(C3, int)' must be declared static and public\n // static C3 operator >>(C3 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"C3.operator \" + op + \"(C3, int)\").WithLocation(20, 24),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1<C4>.operator >>(C4, int)'\n // C4 : I1<C4>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C4>\").WithArguments(\"C4\", \"I1<C4>.operator \" + op + \"(C4, int)\").WithLocation(24, 10),\n // (26,24): error CS8930: Explicit implementation of a user-defined operator 'C4.operator >>(C4, int)' must be declared static\n // C4 I1<C4>.operator >>(C4 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, op).WithArguments(\"C4.operator \" + op + \"(C4, int)\").WithLocation(26, 24),\n // (26,24): error CS0539: 'C4.operator >>(C4, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // C4 I1<C4>.operator >>(C4 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C4.operator \" + op + \"(C4, int)\").WithLocation(26, 24),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1<C5>.operator >>(C5, int)'. 'C5.operator >>(C5, int)' cannot implement 'I1<C5>.operator >>(C5, int)' because it does not have the matching return type of 'C5'.\n // C5 : I1<C5>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1<C5>\").WithArguments(\"C5\", \"I1<C5>.operator \" + op + \"(C5, int)\", \"C5.operator \" + op + \"(C5, int)\", \"C5\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1<C6>.operator >>(C6, int)'\n // C6 : I1<C6>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C6>\").WithArguments(\"C6\", \"I1<C6>.operator \" + op + \"(C6, int)\").WithLocation(36, 10),\n // (38,32): error CS0539: 'C6.operator >>(C6, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1<C6>.operator >> (C6 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C6.operator \" + op + \"(C6, int)\").WithLocation(38, 32),\n // (42,10): error CS0535: 'C7' does not implement interface member 'I1<C7>.operator >>(C7, int)'\n // C7 : I1<C7>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C7>\").WithArguments(\"C7\", \"I1<C7>.operator \" + op + \"(C7, int)\").WithLocation(42, 10),\n // (48,10): error CS0535: 'C8' does not implement interface member 'I1<C8>.operator >>(C8, int)'\n // C8 : I1<C8>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C8>\").WithArguments(\"C8\", \"I1<C8>.operator \" + op + \"(C8, int)\").WithLocation(48, 10),\n // (50,22): error CS0539: 'C8.op_RightShift(C8, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static C8 I1<C8>.op_RightShift(C8 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, opName).WithArguments(\"C8.\" + opName + \"(C8, int)\").WithLocation(50, 22),\n // (59,10): error CS0535: 'C9' does not implement interface member 'I2<C9>.op_RightShift(C9, int)'\n // C9 : I2<C9>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C9>\").WithArguments(\"C9\", \"I2<C9>.\" + opName + \"(C9, int)\").WithLocation(59, 10),\n // (65,11): error CS0535: 'C10' does not implement interface member 'I2<C10>.op_RightShift(C10, int)'\n // C10 : I2<C10>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C10>\").WithArguments(\"C10\", \"I2<C10>.\" + opName + \"(C10, int)\").WithLocation(65, 11),\n // (67,33): error CS0539: 'C10.operator >>(C10, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static C10 I2<C10>.operator >>(C10 x, int y) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C10.operator \" + op + \"(C10, int)\").WithLocation(67, 33)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_03([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\ninterface I2 : I1\n{}\n\ninterface I3 : I1\n{\n I1 operator \" + op + @\"(I1 x) => default;\n}\n\ninterface I4 : I1\n{\n static I1 operator \" + op + @\"(I1 x) => default;\n}\n\ninterface I5 : I1\n{\n I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\ninterface I6 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\ninterface I7 : I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\npublic interface I11<T> where T : I11<T>\n{\n abstract static T operator \" + op + @\"(T x);\n}\n\ninterface I8<T> : I11<T> where T : I8<T>\n{\n T operator \" + op + @\"(T x) => default;\n}\n\ninterface I9<T> : I11<T> where T : I9<T>\n{\n static T operator \" + op + @\"(T x) => default;\n}\n\ninterface I10<T> : I11<T> where T : I10<T>\n{\n abstract static T operator \" + op + @\"(T x);\n}\n\ninterface I12<T> : I11<T> where T : I12<T>\n{\n static T I11<T>.operator \" + op + @\"(T x) => default;\n}\n\ninterface I13<T> : I11<T> where T : I13<T>\n{\n abstract static T I11<T>.operator \" + op + @\"(T x);\n}\n\ninterface I14 : I1\n{\n abstract static I1 I1.operator \" + op + @\"(I1 x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n ErrorCode badSignatureError = op.Length != 2 ? ErrorCode.ERR_BadUnaryOperatorSignature : ErrorCode.ERR_BadIncDecSignature;\n ErrorCode badAbstractSignatureError = op.Length != 2 ? ErrorCode.ERR_BadAbstractUnaryOperatorSignature : ErrorCode.ERR_BadAbstractIncDecSignature;\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (12,17): error CS0558: User-defined operator 'I3.operator +(I1)' must be declared static and public\n // I1 operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"I3.operator \" + op + \"(I1)\").WithLocation(12, 17),\n // (12,17): error CS0562: The parameter of a unary operator must be the containing type\n // I1 operator +(I1 x) => default;\n Diagnostic(badSignatureError, op).WithLocation(12, 17),\n // (17,24): error CS0562: The parameter of a unary operator must be the containing type\n // static I1 operator +(I1 x) => default;\n Diagnostic(badSignatureError, op).WithLocation(17, 24),\n // (22,20): error CS8930: Explicit implementation of a user-defined operator 'I5.operator +(I1)' must be declared static\n // I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, op).WithArguments(\"I5.operator \" + op + \"(I1)\").WithLocation(22, 20),\n // (22,20): error CS0539: 'I5.operator +(I1)' in explicit interface declaration is not found among members of the interface that can be implemented\n // I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I5.operator \" + op + \"(I1)\").WithLocation(22, 20),\n // (27,27): error CS0539: 'I6.operator +(I1)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I6.operator \" + op + \"(I1)\").WithLocation(27, 27),\n // (32,33): error CS8921: The parameter of a unary operator must be the containing type, or its type parameter constrained to it.\n // abstract static I1 operator +(I1 x);\n Diagnostic(badAbstractSignatureError, op).WithLocation(32, 33),\n // (42,16): error CS0558: User-defined operator 'I8<T>.operator +(T)' must be declared static and public\n // T operator +(T x) => default;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"I8<T>.operator \" + op + \"(T)\").WithLocation(42, 16),\n // (42,16): error CS0562: The parameter of a unary operator must be the containing type\n // T operator +(T x) => default;\n Diagnostic(badSignatureError, op).WithLocation(42, 16),\n // (47,23): error CS0562: The parameter of a unary operator must be the containing type\n // static T operator +(T x) => default;\n Diagnostic(badSignatureError, op).WithLocation(47, 23),\n // (57,30): error CS0539: 'I12<T>.operator +(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static T I11<T>.operator +(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I12<T>.operator \" + op + \"(T)\").WithLocation(57, 30),\n // (62,39): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static T I11<T>.operator +(T x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(62, 39),\n // (62,39): error CS0501: 'I13<T>.operator +(T)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static T I11<T>.operator +(T x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, op).WithArguments(\"I13<T>.operator \" + op + \"(T)\").WithLocation(62, 39),\n // (62,39): error CS0539: 'I13<T>.operator +(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static T I11<T>.operator +(T x);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I13<T>.operator \" + op + \"(T)\").WithLocation(62, 39),\n // (67,36): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static I1 I1.operator +(I1 x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(67, 36),\n // (67,36): error CS0501: 'I14.operator +(I1)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static I1 I1.operator +(I1 x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, op).WithArguments(\"I14.operator \" + op + \"(I1)\").WithLocation(67, 36),\n // (67,36): error CS0539: 'I14.operator +(I1)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static I1 I1.operator +(I1 x);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I14.operator \" + op + \"(I1)\").WithLocation(67, 36)\n );\n\n var m01 = compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n\n var i8 = compilation1.GlobalNamespace.GetTypeMember(\"I8\");\n Assert.Null(i8.FindImplementationForInterfaceMember(i8.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i9 = compilation1.GlobalNamespace.GetTypeMember(\"I9\");\n Assert.Null(i9.FindImplementationForInterfaceMember(i9.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i10 = compilation1.GlobalNamespace.GetTypeMember(\"I10\");\n Assert.Null(i10.FindImplementationForInterfaceMember(i10.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i12 = compilation1.GlobalNamespace.GetTypeMember(\"I12\");\n Assert.Null(i12.FindImplementationForInterfaceMember(i12.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i13 = compilation1.GlobalNamespace.GetTypeMember(\"I13\");\n Assert.Null(i13.FindImplementationForInterfaceMember(i13.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I14\").FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_03([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\ninterface I2 : I1\n{}\n\ninterface I3 : I1\n{\n I1 operator \" + op + @\"(I1 x, int y) => default;\n}\n\ninterface I4 : I1\n{\n static I1 operator \" + op + @\"(I1 x, int y) => default;\n}\n\ninterface I5 : I1\n{\n I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\ninterface I6 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\ninterface I7 : I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\npublic interface I11<T> where T : I11<T>\n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\ninterface I8<T> : I11<T> where T : I8<T>\n{\n T operator \" + op + @\"(T x, int y) => default;\n}\n\ninterface I9<T> : I11<T> where T : I9<T>\n{\n static T operator \" + op + @\"(T x, int y) => default;\n}\n\ninterface I10<T> : I11<T> where T : I10<T>\n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\ninterface I12<T> : I11<T> where T : I12<T>\n{\n static T I11<T>.operator \" + op + @\"(T x, int y) => default;\n}\n\ninterface I13<T> : I11<T> where T : I13<T>\n{\n abstract static T I11<T>.operator \" + op + @\"(T x, int y);\n}\n\ninterface I14 : I1\n{\n abstract static I1 I1.operator \" + op + @\"(I1 x, int y);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n bool isShift = op == \"<<\" || op == \">>\";\n ErrorCode badSignatureError = isShift ? ErrorCode.ERR_BadShiftOperatorSignature : ErrorCode.ERR_BadBinaryOperatorSignature;\n ErrorCode badAbstractSignatureError = isShift ? ErrorCode.ERR_BadAbstractShiftOperatorSignature : ErrorCode.ERR_BadAbstractBinaryOperatorSignature;\n\n var expected = new[] {\n // (12,17): error CS0563: One of the parameters of a binary operator must be the containing type\n // I1 operator |(I1 x, int y) => default;\n Diagnostic(badSignatureError, op).WithLocation(12, 17),\n // (17,24): error CS0563: One of the parameters of a binary operator must be the containing type\n // static I1 operator |(I1 x, int y) => default;\n Diagnostic(badSignatureError, op).WithLocation(17, 24),\n // (22,20): error CS8930: Explicit implementation of a user-defined operator 'I5.operator |(I1, int)' must be declared static\n // I1 I1.operator |(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, op).WithArguments(\"I5.operator \" + op + \"(I1, int)\").WithLocation(22, 20),\n // (22,20): error CS0539: 'I5.operator |(I1, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // I1 I1.operator |(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I5.operator \" + op + \"(I1, int)\").WithLocation(22, 20),\n // (27,27): error CS0539: 'I6.operator |(I1, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static I1 I1.operator |(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I6.operator \" + op + \"(I1, int)\").WithLocation(27, 27),\n // (32,33): error CS8924: One of the parameters of a binary operator must be the containing type, or its type parameter constrained to it.\n // abstract static I1 operator |(I1 x, int y);\n Diagnostic(badAbstractSignatureError, op).WithLocation(32, 33),\n // (42,16): error CS0563: One of the parameters of a binary operator must be the containing type\n // T operator |(T x, int y) => default;\n Diagnostic(badSignatureError, op).WithLocation(42, 16),\n // (47,23): error CS0563: One of the parameters of a binary operator must be the containing type\n // static T operator |(T x, int y) => default;\n Diagnostic(badSignatureError, op).WithLocation(47, 23),\n // (57,30): error CS0539: 'I12<T>.operator |(T, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static T I11<T>.operator |(T x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I12<T>.operator \" + op + \"(T, int)\").WithLocation(57, 30),\n // (62,39): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static T I11<T>.operator |(T x, int y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(62, 39),\n // (62,39): error CS0501: 'I13<T>.operator |(T, int)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static T I11<T>.operator |(T x, int y);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, op).WithArguments(\"I13<T>.operator \" + op + \"(T, int)\").WithLocation(62, 39),\n // (62,39): error CS0539: 'I13<T>.operator |(T, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static T I11<T>.operator |(T x, int y);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I13<T>.operator \" + op + \"(T, int)\").WithLocation(62, 39),\n // (67,36): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static I1 I1.operator |(I1 x, int y);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(67, 36),\n // (67,36): error CS0501: 'I14.operator |(I1, int)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static I1 I1.operator |(I1 x, int y);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, op).WithArguments(\"I14.operator \" + op + \"(I1, int)\").WithLocation(67, 36),\n // (67,36): error CS0539: 'I14.operator |(I1, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static I1 I1.operator |(I1 x, int y);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"I14.operator \" + op + \"(I1, int)\").WithLocation(67, 36)\n };\n\n if (op is \"==\" or \"!=\")\n {\n expected = expected.Concat(\n new[] {\n // (12,17): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // I1 operator ==(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, op).WithLocation(12, 17),\n // (17,24): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // static I1 operator ==(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, op).WithLocation(17, 24),\n // (42,16): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // T operator ==(T x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, op).WithLocation(42, 16),\n // (47,23): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // static T operator ==(T x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, op).WithLocation(47, 23),\n }\n ).ToArray();\n }\n else\n {\n expected = expected.Concat(\n new[] {\n // (12,17): error CS0558: User-defined operator 'I3.operator |(I1, int)' must be declared static and public\n // I1 operator |(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"I3.operator \" + op + \"(I1, int)\").WithLocation(12, 17),\n // (42,16): error CS0558: User-defined operator 'I8<T>.operator |(T, int)' must be declared static and public\n // T operator |(T x, int y) => default;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, op).WithArguments(\"I8<T>.operator \" + op + \"(T, int)\").WithLocation(42, 16)\n }\n ).ToArray();\n }\n\n compilation1.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(expected);\n\n var m01 = compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n\n var i8 = compilation1.GlobalNamespace.GetTypeMember(\"I8\");\n Assert.Null(i8.FindImplementationForInterfaceMember(i8.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i9 = compilation1.GlobalNamespace.GetTypeMember(\"I9\");\n Assert.Null(i9.FindImplementationForInterfaceMember(i9.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i10 = compilation1.GlobalNamespace.GetTypeMember(\"I10\");\n Assert.Null(i10.FindImplementationForInterfaceMember(i10.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i12 = compilation1.GlobalNamespace.GetTypeMember(\"I12\");\n Assert.Null(i12.FindImplementationForInterfaceMember(i12.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i13 = compilation1.GlobalNamespace.GetTypeMember(\"I13\");\n Assert.Null(i13.FindImplementationForInterfaceMember(i13.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I14\").FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_04([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\npublic interface I2<T> where T : I2<T>\n{\n abstract static T operator \" + op + @\"(T x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\" + typeKeyword + @\"\n Test2: I2<Test2>\n{\n public static Test2 operator \" + op + @\"(Test2 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (4,15): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I1.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 15)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (4,15): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I1.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 15),\n // (14,33): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator +(I1 x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(14, 33),\n // (19,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static T operator +(T x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 32)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_04([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\npublic interface I2<T> where T : I2<T>\n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\" + typeKeyword + @\"\n Test2: I2<Test2>\n{\n public static Test2 operator \" + op + @\"(Test2 x, int y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.WRN_EqualityOpWithoutEquals or (int)ErrorCode.WRN_EqualityOpWithoutGetHashCode)).Verify(\n // (4,15): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static I1 I1.operator +(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I1.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 15)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.WRN_EqualityOpWithoutEquals or (int)ErrorCode.WRN_EqualityOpWithoutGetHashCode)).Verify(\n // (4,15): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static I1 I1.operator +(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I1.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 15),\n // (14,33): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static I1 operator +(I1 x, int y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(14, 33),\n // (19,32): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static T operator +(T x, int y);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, op).WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(19, 32)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_05([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T> \n{\n abstract static T operator \" + op + @\"(T x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1<Test1>\n{\n public static Test1 operator \" + op + @\"(Test1 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (2,12): error CS8929: 'Test1.operator +(Test1)' cannot implement interface member 'I1<Test1>.operator +(Test1)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.operator \" + op + \"(Test1)\", \"I1<Test1>.operator \" + op + \"(Test1)\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (2,12): error CS8929: 'Test1.operator +(Test1)' cannot implement interface member 'I1<Test1>.operator +(Test1)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.operator \" + op + \"(Test1)\", \"I1<Test1>.operator \" + op + \"(Test1)\", \"Test1\").WithLocation(2, 12),\n // (9,32): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static T operator +(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(9, 32)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_05([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T> \n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1<Test1>\n{\n public static Test1 operator \" + op + @\"(Test1 x, int y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.WRN_EqualityOpWithoutEquals or (int)ErrorCode.WRN_EqualityOpWithoutGetHashCode)).Verify(\n // (2,12): error CS8929: 'Test1.operator >>(Test1, int)' cannot implement interface member 'I1<Test1>.operator >>(Test1, int)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.operator \" + op + \"(Test1, int)\", \"I1<Test1>.operator \" + op + \"(Test1, int)\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.WRN_EqualityOpWithoutEquals or (int)ErrorCode.WRN_EqualityOpWithoutGetHashCode)).Verify(\n // (2,12): error CS8929: 'Test1.operator >>(Test1, int)' cannot implement interface member 'I1<Test1>.operator >>(Test1, int)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.operator \" + op + \"(Test1, int)\", \"I1<Test1>.operator \" + op + \"(Test1, int)\", \"Test1\").WithLocation(2, 12),\n // (9,32): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static T operator >>(T x, int y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(9, 32)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_06([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,27): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(4, 27)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OperatorNeedsMatch or (int)ErrorCode.ERR_OpTFRetType)).Verify(\n // (4,27): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static I1 I1.operator +(I1 x) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(4, 27),\n // (9,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator +(I1 x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(9, 33)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_06([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,27): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static I1 I1.operator +(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(4, 27)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (4,27): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static I1 I1.operator +(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(4, 27),\n // (9,33): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static I1 operator +(I1 x, int y);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, op).WithLocation(9, 33)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_07([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\")] string op, bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x);\n}\n\n\" + typeKeyword + @\"\n C : I1<C>\n{\n public static C operator \" + op + @\"(C x) => default;\n}\n\";\n\n var opName = UnaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n var i1 = c.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.True(cM01.HasSpecialName);\n\n Assert.Equal(\"C C.\" + opName + \"(C x)\", cM01.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryTrueFalseOperator_07([CombinatorialValues(\"true\", \"false\")] string op, bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static bool operator \" + op + @\"(T x);\n}\n\npartial \" + typeKeyword + @\"\n C : I1<C>\n{\n public static bool operator \" + op + @\"(C x) => default;\n}\n\";\n string matchingOp = op == \"true\" ? \"false\" : \"true\";\n\n source1 +=\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static bool operator \" + matchingOp + @\"(T x);\n}\n\npartial \" + typeKeyword + @\"\n C\n{\n public static bool operator \" + matchingOp + @\"(C x) => default;\n}\n\";\n\n var opName = UnaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n var i1 = c.Interfaces().Single();\n var m01 = i1.GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.True(cM01.HasSpecialName);\n\n Assert.Equal(\"System.Boolean C.\" + opName + \"(C x)\", cM01.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_07([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x, int y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npartial \" + typeKeyword + @\"\n C : I1<C>\n{\n public static C operator \" + op + @\"(C x, int y) => default;\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + matchingOp + @\"(T x, int y);\n}\n\npartial \" + typeKeyword + @\"\n C\n{\n public static C operator \" + matchingOp + @\"(C x, int y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n var i1 = c.Interfaces().Single();\n var m01 = i1.GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.Equal(matchingOp is null ? 1 : 2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.True(cM01.HasSpecialName);\n\n Assert.Equal(\"C C.\" + opName + \"(C x, System.Int32 y)\", cM01.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_08([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\")] string op, bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n\n var opName = UnaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<LiteralExpressionSyntax>().Single();\n\n Assert.Equal(\"default\", node.ToString());\n Assert.Equal(\"I1\", model.GetTypeInfo(node).ConvertedType.ToTestDisplayString());\n\n var declaredSymbol = model.GetDeclaredSymbol(node.FirstAncestorOrSelf<OperatorDeclarationSyntax>());\n Assert.Equal(\"I1 C.I1.\" + opName + \"(I1 x)\", declaredSymbol.ToTestDisplayString());\n Assert.DoesNotContain(opName, declaredSymbol.ContainingType.MemberNames);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.False(cM01.HasSpecialName);\n\n Assert.Equal(\"I1 C.I1.\" + opName + \"(I1 x)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryTrueFalseOperator_08([CombinatorialValues(\"true\", \"false\")] string op, bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic partial interface I1\n{\n abstract static bool operator \" + op + @\"(I1 x);\n}\n\npartial \" + typeKeyword + @\"\n C : I1\n{\n static bool I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n string matchingOp = op == \"true\" ? \"false\" : \"true\";\n\n source1 +=\n@\"\npublic partial interface I1\n{\n abstract static bool operator \" + matchingOp + @\"(I1 x);\n}\n\npartial \" + typeKeyword + @\"\n C\n{\n static bool I1.operator \" + matchingOp + @\"(I1 x) => default;\n}\n\";\n\n var opName = UnaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<LiteralExpressionSyntax>().First();\n\n Assert.Equal(\"default\", node.ToString());\n Assert.Equal(\"System.Boolean\", model.GetTypeInfo(node).ConvertedType.ToTestDisplayString());\n\n var declaredSymbol = model.GetDeclaredSymbol(node.FirstAncestorOrSelf<OperatorDeclarationSyntax>());\n Assert.Equal(\"System.Boolean C.I1.\" + opName + \"(I1 x)\", declaredSymbol.ToTestDisplayString());\n Assert.DoesNotContain(opName, declaredSymbol.ContainingType.MemberNames);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers(opName).OfType<MethodSymbol>().Single();\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.False(cM01.HasSpecialName);\n\n Assert.Equal(\"System.Boolean C.I1.\" + opName + \"(I1 x)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_08([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic partial interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\npartial \" + typeKeyword + @\"\n C : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1\n{\n abstract static I1 operator \" + matchingOp + @\"(I1 x, int y);\n}\n\npartial \" + typeKeyword + @\"\n C\n{\n static I1 I1.operator \" + matchingOp + @\"(I1 x, int y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<LiteralExpressionSyntax>().First();\n\n Assert.Equal(\"default\", node.ToString());\n Assert.Equal(\"I1\", model.GetTypeInfo(node).ConvertedType.ToTestDisplayString());\n\n var declaredSymbol = model.GetDeclaredSymbol(node.FirstAncestorOrSelf<OperatorDeclarationSyntax>());\n Assert.Equal(\"I1 C.I1.\" + opName + \"(I1 x, System.Int32 y)\", declaredSymbol.ToTestDisplayString());\n Assert.DoesNotContain(opName, declaredSymbol.ContainingType.MemberNames);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers(opName).OfType<MethodSymbol>().Single();\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(matchingOp is null ? 1 : 2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.False(cM01.HasSpecialName);\n\n Assert.Equal(\"I1 C.I1.\" + opName + \"(I1 x, System.Int32 y)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_09([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\")] string op)\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\npublic class C2 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n var opName = UnaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var cM01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"I1 C2.I1.\" + opName + \"(I1 x)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryTrueFalseOperator_09([CombinatorialValues(\"true\", \"false\")] string op)\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic partial interface I1\n{\n abstract static bool operator \" + op + @\"(I1 x);\n}\n\npublic partial class C2 : I1\n{\n static bool I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n string matchingOp = op == \"true\" ? \"false\" : \"true\";\n\n source1 +=\n@\"\npublic partial interface I1\n{\n abstract static bool operator \" + matchingOp + @\"(I1 x);\n}\n\npublic partial class C2\n{\n static bool I1.operator \" + matchingOp + @\"(I1 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n var opName = UnaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var cM01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"System.Boolean C2.I1.\" + opName + \"(I1 x)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_09([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic partial interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\npublic partial class C2 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1\n{\n abstract static I1 operator \" + matchingOp + @\"(I1 x, int y);\n}\n\npublic partial class C2\n{\n static I1 I1.operator \" + matchingOp + @\"(I1 x, int y) => default;\n}\n\";\n }\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n var opName = BinaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var cM01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"I1 C2.I1.\" + opName + \"(I1 x, System.Int32 y)\", cM01.ToTestDisplayString());\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_10([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var opName = UnaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n class I1 \" + opName + @\" (\n class I1 x\n ) cil managed \n {\n }\n}\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements I1\n{\n .method private hidebysig\n static class I1 I1.\" + opName + @\" (class I1 x) cil managed \n {\n .override method class I1 I1::\" + opName + @\"(class I1)\n\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig static\n specialname class I1 \" + opName + @\" (class I1 x) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: ret\n }\n}\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements I1\n{\n .method public hidebysig static\n specialname class I1 \" + opName + @\" (class I1 x) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n } // end of method C2::.ctor\n} // end of class C2\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1\n{\n}\n\npublic class C5 : C2, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Equal(MethodKind.UserDefinedOperator, c1.GetMember<MethodSymbol>(opName).MethodKind);\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"I1 C1.I1.\" + opName + \"(I1 x)\", c1M01.ToTestDisplayString());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n var c2M01 = (MethodSymbol)c5.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"I1 C2.\" + opName + \"(I1 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(MethodKind.UserDefinedOperator, c2M01.MethodKind);\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_10([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var opName = BinaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n class I1 \" + opName + @\" (\n class I1 x,\n int32 y\n ) cil managed \n {\n }\n}\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements I1\n{\n .method private hidebysig\n static class I1 I1.\" + opName + @\" (class I1 x, int32 y) cil managed \n {\n .override method class I1 I1::\" + opName + @\"(class I1, int32)\n\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig static\n specialname class I1 \" + opName + @\" (class I1 x, int32 y) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: ret\n }\n}\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements I1\n{\n .method public hidebysig static\n specialname class I1 \" + opName + @\" (class I1 x, int32 y) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n } // end of method C2::.ctor\n} // end of class C2\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1\n{\n}\n\npublic class C5 : C2, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Equal(MethodKind.UserDefinedOperator, c1.GetMember<MethodSymbol>(opName).MethodKind);\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"I1 C1.I1.\" + opName + \"(I1 x, System.Int32 y)\", c1M01.ToTestDisplayString());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n var c2M01 = (MethodSymbol)c5.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"I1 C2.\" + opName + \"(I1 x, System.Int32 y)\", c2M01.ToTestDisplayString());\n Assert.Equal(MethodKind.UserDefinedOperator, c2M01.MethodKind);\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_11([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n\n var opName = UnaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname virtual\n static class I1 \" + opName + @\" (\n class I1 x\n ) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,27): error CS0539: 'C1.operator ~(I1)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static I1 I1.operator ~(I1 x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C1.operator \" + op + \"(I1)\").WithLocation(4, 27)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(\"I1 I1.\" + opName + \"(I1 x)\", m01.ToTestDisplayString());\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_11([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n\n var opName = BinaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname virtual\n static class I1 \" + opName + @\" (\n class I1 x,\n int32 y\n ) cil managed \n {\n IL_0000: ldnull\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,27): error CS0539: 'C1.operator <(I1, int)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static I1 I1.operator <(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, op).WithArguments(\"C1.operator \" + op + \"(I1, int)\").WithLocation(4, 27)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(\"I1 I1.\" + opName + \"(I1 x, System.Int32 y)\", m01.ToTestDisplayString());\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_12([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var opName = UnaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n class I1 \" + opName + @\" (\n class I1 x\n ) cil managed \n {\n }\n}\n.class interface public auto ansi abstract I2\n implements I1\n{\n .method private hidebysig\n static class I1 I1.\" + opName + @\" (class I1 x) cil managed \n {\n .override method class I1 I1::\" + opName + @\"(class I1)\n\n IL_0000: ldnull\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I2\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.operator ~(I1)'\n // public class C1 : I2\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2\").WithArguments(\"C1\", \"I1.operator \" + op + \"(I1)\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n\n var i2M01 = i2.GetMembers().OfType<MethodSymbol>().Single();\n Assert.Same(m01, i2M01.ExplicitInterfaceImplementations.Single());\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_12([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var opName = BinaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n class I1 \" + opName + @\" (\n class I1 x,\n int32 y\n ) cil managed \n {\n }\n}\n.class interface public auto ansi abstract I2\n implements I1\n{\n .method private hidebysig\n static class I1 I1.\" + opName + @\" (class I1 x, int32 y) cil managed \n {\n .override method class I1 I1::\" + opName + @\"(class I1, int32)\n\n IL_0000: ldnull\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I2\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.operator /(I1, int)'\n // public class C1 : I2\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2\").WithArguments(\"C1\", \"I1.operator \" + op + \"(I1, int)\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.UserDefinedOperator, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n\n var i2M01 = i2.GetMembers().OfType<MethodSymbol>().Single();\n Assert.Same(m01, i2M01.ExplicitInterfaceImplementations.Single());\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_13([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // A forwarding method is added for an implicit implementation declared in base class. \n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x, C1 y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1\n{\n public static C2 operator \" + op + @\"(C2 x, C1 y) => default;\n}\n\npublic class C2 : C1, I1<C2>\n{\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T>\n{\n abstract static T operator \" + matchingOp + @\"(T x, C1 y);\n}\n\npublic partial class C1\n{\n public static C2 operator \" + matchingOp + @\"(C2 x, C1 y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var i1 = c2.Interfaces().Single();\n var m01 = i1.GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n Assert.False(c2M01.HasRuntimeSpecialName);\n Assert.False(c2M01.HasSpecialName);\n\n Assert.Equal(\"C2 C2.I1<C2>.\" + opName + \"(C2 x, C1 y)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n var c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n Assert.False(c1M01.HasRuntimeSpecialName);\n Assert.True(c1M01.HasSpecialName);\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.UserDefinedOperator, c2M01.MethodKind);\n Assert.False(c2M01.HasRuntimeSpecialName);\n Assert.True(c2M01.HasSpecialName);\n\n Assert.Equal(\"C2 C1.\" + opName + \"(C2 x, C1 y)\", c2M01.ToTestDisplayString());\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n }\n }\n\n verifier.VerifyIL(\"C2.I1<C2>.\" + opName + \"(C2, C1)\",\n@\"\n{\n // Code size 8 (0x8)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: call \"\"C2 C1.\" + opName + @\"(C2, C1)\"\"\n IL_0007: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_14([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\")] string op)\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var opName = UnaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n !T modopt(I1`1) \" + opName + @\" (\n !T x\n ) cil managed \n {\n }\n} \n\";\n\n var source1 =\n@\"\nclass C1 : I1<C1>\n{\n public static C1 operator \" + op + @\"(C1 x) => default;\n}\n\nclass C2 : I1<C2>\n{\n static C2 I1<C2>.operator \" + op + @\"(C2 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(\"C1 modopt(I1<>) C1.I1<C1>.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n Assert.Equal(\"C1 C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n Assert.Equal(\"C1 C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n\n Assert.Equal(\"C2 modopt(I1<>) C2.I1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.Same(c2M01, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single());\n }\n\n verifier.VerifyIL(\"C1.I1<C1>.\" + opName + \"(C1)\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"C1 C1.\" + opName + @\"(C1)\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryTrueFalseOperator_14([CombinatorialValues(\"true\", \"false\")] string op)\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var opName = UnaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n bool modopt(I1`1) \" + opName + @\" (\n !T x\n ) cil managed \n {\n }\n} \n\";\n\n var source1 =\n@\"\nclass C1 : I1<C1>\n{\n public static bool operator \" + op + @\"(C1 x) => default;\n public static bool operator \" + (op == \"true\" ? \"false\" : \"true\") + @\"(C1 x) => default;\n}\n\nclass C2 : I1<C2>\n{\n static bool I1<C2>.operator \" + op + @\"(C2 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(\"System.Boolean modopt(I1<>) C1.I1<C1>.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n Assert.Equal(\"System.Boolean C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n Assert.Equal(\"System.Boolean C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n\n Assert.Equal(\"System.Boolean modopt(I1<>) C2.I1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.Same(c2M01, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single());\n }\n\n verifier.VerifyIL(\"C1.I1<C1>.\" + opName + \"(C1)\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"bool C1.\" + opName + @\"(C1)\"\"\n IL_0006: ret\n}\n\");\n }\n\n private static string MatchingBinaryOperator(string op)\n {\n return op switch { \"<\" => \">\", \">\" => \"<\", \"<=\" => \">=\", \">=\" => \"<=\", \"==\" => \"!=\", \"!=\" => \"==\", _ => null };\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_14([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var opName = BinaryOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n !T modopt(I1`1) \" + opName + @\" (\n !T x,\n int32 y\n ) cil managed \n {\n }\n} \n\";\n string matchingOp = MatchingBinaryOperator(op);\n string additionalMethods = \"\";\n\n if (matchingOp is object)\n {\n additionalMethods =\n@\"\n public static C1 operator \" + matchingOp + @\"(C1 x, int y) => default;\n\";\n }\n\n var source1 =\n@\"\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\nclass C1 : I1<C1>\n{\n public static C1 operator \" + op + @\"(C1 x, int y) => default;\n\" + additionalMethods + @\"\n}\n\nclass C2 : I1<C2>\n{\n static C2 I1<C2>.operator \" + op + @\"(C2 x, int y) => default;\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(\"C1 modopt(I1<>) C1.I1<C1>.\" + opName + \"(C1 x, System.Int32 y)\", c1M01.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n Assert.Equal(\"C1 C1.\" + opName + \"(C1 x, System.Int32 y)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.UserDefinedOperator, c1M01.MethodKind);\n Assert.Equal(\"C1 C1.\" + opName + \"(C1 x, System.Int32 y)\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n\n Assert.Equal(\"C2 modopt(I1<>) C2.I1<C2>.\" + opName + \"(C2 x, System.Int32 y)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.Same(c2M01, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single());\n }\n\n verifier.VerifyIL(\"C1.I1<C1>.\" + opName + \"(C1, int)\",\n@\"\n{\n // Code size 8 (0x8)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: call \"\"C1 C1.\" + opName + @\"(C1, int)\"\"\n IL_0007: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticUnaryOperator_15([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\")] string op)\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\npublic partial class C2 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n var opName = UnaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m02 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var c2M02 = c3.BaseType().GetMembers(\"I1.\" + opName).OfType<MethodSymbol>().Single();\n Assert.Equal(\"I1 C2.I1.\" + opName + \"(I1 x)\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticUnaryTrueFalseOperator_15()\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static bool operator true(I1 x);\n abstract static bool operator false(I1 x);\n}\n\npublic partial class C2 : I1\n{\n static bool I1.operator true(I1 x) => default;\n static bool I1.operator false(I1 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(\"op_True\").OfType<MethodSymbol>().Single();\n var m02 = c3.Interfaces().Single().GetMembers(\"op_False\").OfType<MethodSymbol>().Single();\n\n var c2M01 = c3.BaseType().GetMembers(\"I1.op_True\").OfType<MethodSymbol>().Single();\n Assert.Equal(\"System.Boolean C2.I1.op_True(I1 x)\", c2M01.ToTestDisplayString());\n Assert.Same(c2M01, c3.FindImplementationForInterfaceMember(m01));\n\n var c2M02 = c3.BaseType().GetMembers(\"I1.op_False\").OfType<MethodSymbol>().Single();\n Assert.Equal(\"System.Boolean C2.I1.op_False(I1 x)\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_15([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x, C1 y);\n abstract static T operator \" + op + @\"(T x, C2 y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1\n{\n public static C2 operator \" + op + @\"(C2 x, C1 y) => default;\n}\n\npublic partial class C2 : C1, I1<C2>\n{\n static C2 I1<C2>.operator \" + op + @\"(C2 x, C2 y) => default;\n}\n\";\n\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T>\n{\n abstract static T operator \" + matchingOp + @\"(T x, C1 y);\n abstract static T operator \" + matchingOp + @\"(T x, C2 y);\n}\n\npublic partial class C1\n{\n public static C2 operator \" + matchingOp + @\"(C2 x, C1 y) => default;\n}\n\npublic partial class C2\n{\n static C2 I1<C2>.operator \" + matchingOp + @\"(C2 x, C2 y) => default;\n}\n\";\n }\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1<C2>\n{\n}\n\";\n\n var opName = BinaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().First();\n\n var c1M01 = c3.BaseType().BaseType().GetMember<MethodSymbol>(opName);\n Assert.Equal(\"C2 C1.\" + opName + \"(C2 x, C1 y)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n if (c1M01.ContainingModule is PEModuleSymbol)\n {\n var c2M01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C2 C2.I1<C2>.\" + opName + \"(C2 x, C1 y)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n }\n\n var m02 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().ElementAt(1);\n\n var c2M02 = c3.BaseType().GetMembers(\"I1<C2>.\" + opName).OfType<MethodSymbol>().First();\n Assert.Equal(\"C2 C2.I1<C2>.\" + opName + \"(C2 x, C2 y)\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_16([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n // A new implicit implementation is properly considered.\n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static T operator \" + op + @\"(T x, C1 y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1 : I1<C2>\n{\n public static C2 operator \" + op + @\"(C2 x, C1 y) => default;\n}\n\npublic partial class C2 : C1\n{\n public static C2 operator \" + op + @\"(C2 x, C1 y) => default;\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T>\n{\n abstract static T operator \" + matchingOp + @\"(T x, C1 y);\n}\n\npublic partial class C1 : I1<C2>\n{\n public static C2 operator \" + matchingOp + @\"(C2 x, C1 y) => default;\n}\n\npublic partial class C2 : C1\n{\n public static C2 operator \" + matchingOp + @\"(C2 x, C1 y) => default;\n}\n\";\n }\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1<C2>\n{\n}\n\";\n\n var opName = BinaryOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n var verifier = CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"C3.I1<C2>.\" + opName + \"(C2, C1)\",\n@\"\n{\n // Code size 8 (0x8)\n .maxstack 2\n IL_0000: ldarg.0\n IL_0001: ldarg.1\n IL_0002: call \"\"C2 C2.\" + opName + @\"(C2, C1)\"\"\n IL_0007: ret\n}\n\");\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n var m01 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var c2M01 = c3.BaseType().GetMember<MethodSymbol>(opName);\n Assert.Equal(\"C2 C2.\" + opName + \"(C2 x, C1 y)\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n if (module is PEModuleSymbol)\n {\n var c3M01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C2 C3.I1<C2>.\" + opName + \"(C2 x, C1 y)\", c3M01.ToTestDisplayString());\n Assert.Equal(m01, c3M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c2M01, c3.FindImplementationForInterfaceMember(m01));\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_18([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool genericFirst)\n {\n // An \"ambiguity\" in implicit implementation declared in generic base class plus interface is generic too.\n\n var generic =\n@\"\n public static C1<T, U> operator \" + op + @\"(C1<T, U> x, U y) => default;\n\";\n var nonGeneric =\n@\"\n public static C1<T, U> operator \" + op + @\"(C1<T, U> x, int y) => default;\n\";\n var source1 =\n@\"\npublic partial interface I1<T, U> where T : I1<T, U>\n{\n abstract static T operator \" + op + @\"(T x, U y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1<T, U> : I1<C1<T, U>, U>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T, U>\n{\n abstract static T operator \" + matchingOp + @\"(T x, U y);\n}\n\npublic partial class C1<T, U>\n{\n public static C1<T, U> operator \" + matchingOp + @\"(C1<T, U> x, U y) => default;\n public static C1<T, U> operator \" + matchingOp + @\"(C1<T, U> x, int y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n compilation1.VerifyDiagnostics();\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(opName)).Count());\n\n var source2 =\n@\"\npublic class C2 : C1<int, int>, I1<C1<int, int>, int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C1<T, U> C1<T, U>.\" + opName + \"(C1<T, U> x, U y)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C1<T, U> C1<T, U>.\" + opName + \"(C1<T, U> x, U y)\", baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_20([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool genericFirst)\n {\n // Same as ImplementAbstractStaticBinaryOperator_18 only implementation is explicit in source.\n\n var generic =\n@\"\n static C1<T, U> I1<C1<T, U>, U>.operator \" + op + @\"(C1<T, U> x, U y) => default;\n\";\n var nonGeneric =\n@\"\n public static C1<T, U> operator \" + op + @\"(C1<T, U> x, int y) => default;\n\";\n var source1 =\n@\"\npublic partial interface I1<T, U> where T : I1<T, U>\n{\n abstract static T operator \" + op + @\"(T x, U y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1<T, U> : I1<C1<T, U>, U>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T, U> where T : I1<T, U>\n{\n abstract static T operator \" + matchingOp + @\"(T x, U y);\n}\n\npublic partial class C1<T, U> : I1<C1<T, U>, U>\n{\n public static C1<T, U> operator \" + matchingOp + @\"(C1<T, U> x, int y) => default;\n static C1<T, U> I1<C1<T, U>, U>.operator \" + matchingOp + @\"(C1<T, U> x, U y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n compilation1.VerifyDiagnostics();\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(opName)).Count());\n\n var source2 =\n@\"\npublic class C2 : C1<int, int>, I1<C1<int, int>, int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C1<T, U> C1<T, U>.I1<C1<T, U>, U>.\" + opName + \"(C1<T, U> x, U y)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticBinaryOperator_22([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op, bool genericFirst)\n {\n // Same as ImplementAbstractStaticMethod_18 only implicit implementation is in an intermediate base.\n\n var generic =\n@\"\n public static C11<T, U> operator \" + op + @\"(C11<T, U> x, C1<T, U> y) => default;\n\";\n var nonGeneric =\n@\"\n public static C11<T, U> operator \" + op + @\"(C11<T, int> x, C1<T, U> y) => default;\n\";\n var source1 =\n@\"\npublic partial interface I1<T, U> where T : I1<T, U>\n{\n abstract static T operator \" + op + @\"(T x, U y);\n}\n\n#pragma warning disable CS0660, CS0661 // 'C1' defines operator == or operator != but does not override Object.Equals(object o)/Object.GetHashCode()\n\npublic partial class C1<T, U>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\npublic class C11<T, U> : C1<T, U>, I1<C11<T, U>, C1<T, U>>\n{\n}\n\";\n string matchingOp = MatchingBinaryOperator(op);\n\n if (matchingOp is object)\n {\n source1 +=\n@\"\npublic partial interface I1<T, U>\n{\n abstract static T operator \" + matchingOp + @\"(T x, U y);\n}\n\npublic partial class C1<T, U>\n{\n public static C11<T, U> operator \" + matchingOp + @\"(C11<T, U> x, C1<T, U> y) => default;\n public static C11<T, U> operator \" + matchingOp + @\"(C11<T, int> x, C1<T, U> y) => default;\n}\n\";\n }\n\n var opName = BinaryOperatorName(op);\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n compilation1.VerifyDiagnostics();\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(opName)).Count());\n\n var source2 =\n@\"\npublic class C2 : C11<int, int>, I1<C11<int, int>, C1<int, int>>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n var expectedDisplay = m01.ContainingModule is PEModuleSymbol ? \"C11<T, U> C11<T, U>.I1<C11<T, U>, C1<T, U>>.\" + opName + \"(C11<T, U> x, C1<T, U> y)\" : \"C11<T, U> C1<T, U>.\" + opName + \"(C11<T, U> x, C1<T, U> y)\";\n Assert.Equal(expectedDisplay, c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(expectedDisplay, baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitImplementationModifiersUnaryOperator_01([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x);\n}\n\nclass\n C1 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C2 : I1\n{\n private static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C3 : I1\n{\n protected static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C4 : I1\n{\n internal static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C5 : I1\n{\n protected internal static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C6 : I1\n{\n private protected static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C7 : I1\n{\n public static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C8 : I1\n{\n static partial I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C9 : I1\n{\n async static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C10 : I1\n{\n unsafe static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C11 : I1\n{\n static readonly I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C12 : I1\n{\n extern static I1 I1.operator \" + op + @\"(I1 x);\n}\n\nclass\n C13 : I1\n{\n abstract static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C14 : I1\n{\n virtual static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\nclass\n C15 : I1\n{\n sealed static I1 I1.operator \" + op + @\"(I1 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n\n Assert.Equal(Accessibility.Private, c1.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single().DeclaredAccessibility);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.WRN_ExternMethodNoImplementation or (int)ErrorCode.ERR_OpTFRetType or (int)ErrorCode.ERR_OperatorNeedsMatch)).Verify(\n // (16,35): error CS0106: The modifier 'private' is not valid for this item\n // private static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"private\").WithLocation(16, 35),\n // (22,37): error CS0106: The modifier 'protected' is not valid for this item\n // protected static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"protected\").WithLocation(22, 37),\n // (28,36): error CS0106: The modifier 'internal' is not valid for this item\n // internal static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"internal\").WithLocation(28, 36),\n // (34,46): error CS0106: The modifier 'protected internal' is not valid for this item\n // protected internal static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"protected internal\").WithLocation(34, 46),\n // (40,45): error CS0106: The modifier 'private protected' is not valid for this item\n // private protected static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"private protected\").WithLocation(40, 45),\n // (46,34): error CS0106: The modifier 'public' is not valid for this item\n // public static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"public\").WithLocation(46, 34),\n // (52,12): error CS0267: The 'partial' modifier can only appear immediately before 'class', 'record', 'struct', 'interface', or a method return type.\n // static partial I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_PartialMisplaced, \"partial\").WithLocation(52, 12),\n // (58,33): error CS0106: The modifier 'async' is not valid for this item\n // async static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"async\").WithLocation(58, 33),\n // (70,36): error CS0106: The modifier 'readonly' is not valid for this item\n // static readonly I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"readonly\").WithLocation(70, 36),\n // (82,36): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(82, 36),\n // (88,35): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"virtual\").WithLocation(88, 35),\n // (94,34): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static I1 I1.operator !(I1 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"sealed\").WithLocation(94, 34)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitImplementationModifiersBinaryOperator_01([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static I1 operator \" + op + @\"(I1 x, int y);\n}\n\nstruct\n C1 : I1\n{\n static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C2 : I1\n{\n private static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C3 : I1\n{\n protected static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C4 : I1\n{\n internal static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C5 : I1\n{\n protected internal static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C6 : I1\n{\n private protected static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C7 : I1\n{\n public static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C8 : I1\n{\n static partial I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C9 : I1\n{\n async static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C10 : I1\n{\n unsafe static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C11 : I1\n{\n static readonly I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C12 : I1\n{\n extern static I1 I1.operator \" + op + @\"(I1 x, int y);\n}\n\nstruct\n C13 : I1\n{\n abstract static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C14 : I1\n{\n virtual static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\nstruct\n C15 : I1\n{\n sealed static I1 I1.operator \" + op + @\"(I1 x, int y) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n\n Assert.Equal(Accessibility.Private, c1.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single().DeclaredAccessibility);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.WRN_ExternMethodNoImplementation or (int)ErrorCode.ERR_OperatorNeedsMatch)).Verify(\n // (16,35): error CS0106: The modifier 'private' is not valid for this item\n // private static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"private\").WithLocation(16, 35),\n // (22,37): error CS0106: The modifier 'protected' is not valid for this item\n // protected static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"protected\").WithLocation(22, 37),\n // (28,36): error CS0106: The modifier 'internal' is not valid for this item\n // internal static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"internal\").WithLocation(28, 36),\n // (34,46): error CS0106: The modifier 'protected internal' is not valid for this item\n // protected internal static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"protected internal\").WithLocation(34, 46),\n // (40,45): error CS0106: The modifier 'private protected' is not valid for this item\n // private protected static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"private protected\").WithLocation(40, 45),\n // (46,34): error CS0106: The modifier 'public' is not valid for this item\n // public static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"public\").WithLocation(46, 34),\n // (52,12): error CS0267: The 'partial' modifier can only appear immediately before 'class', 'record', 'struct', 'interface', or a method return type.\n // static partial I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_PartialMisplaced, \"partial\").WithLocation(52, 12),\n // (58,33): error CS0106: The modifier 'async' is not valid for this item\n // async static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"async\").WithLocation(58, 33),\n // (70,36): error CS0106: The modifier 'readonly' is not valid for this item\n // static readonly I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"readonly\").WithLocation(70, 36),\n // (82,36): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"abstract\").WithLocation(82, 36),\n // (88,35): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"virtual\").WithLocation(88, 35),\n // (94,34): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static I1 I1.operator ^(I1 x, int y) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, op).WithArguments(\"sealed\").WithLocation(94, 34)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitInterfaceSpecifierErrorsUnaryOperator_01([CombinatorialValues(\"+\", \"-\", \"!\", \"~\", \"++\", \"--\", \"true\", \"false\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : struct\n{\n abstract static I1<T> operator \" + op + @\"(I1<T> x);\n}\n\nclass C1\n{\n static I1<int> I1<int>.operator \" + op + @\"(I1<int> x) => default;\n}\n\nclass C2 : I1<C2>\n{\n static I1<C2> I1<C2>.operator \" + op + @\"(I1<C2> x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not ((int)ErrorCode.ERR_OpTFRetType or (int)ErrorCode.ERR_OperatorNeedsMatch)).Verify(\n // (9,20): error CS0540: 'C1.I1<int>.operator -(I1<int>)': containing type does not implement interface 'I1<int>'\n // static I1<int> I1<int>.operator -(I1<int> x) => default;\n Diagnostic(ErrorCode.ERR_ClassDoesntImplementInterface, \"I1<int>\").WithArguments(\"C1.I1<int>.operator \" + op + \"(I1<int>)\", \"I1<int>\").WithLocation(9, 20),\n // (12,7): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // class C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, \"C2\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(12, 7),\n // (14,19): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator -(I1<C2> x) => default;\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, \"I1<C2>\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 19),\n // (14,35): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator -(I1<C2> x) => default;\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, op).WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 35),\n // (14,44): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator -(I1<C2> x) => default;\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, \"x\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 44 + op.Length - 1)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitInterfaceSpecifierErrorsBinaryOperator_01([CombinatorialValues(\"+\", \"-\", \"*\", \"/\", \"%\", \"&\", \"|\", \"^\", \"<<\", \">>\", \"<\", \">\", \"<=\", \">=\", \"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : class\n{\n abstract static I1<T> operator \" + op + @\"(I1<T> x, int y);\n}\n\nstruct C1\n{\n static I1<string> I1<string>.operator \" + op + @\"(I1<string> x, int y) => default;\n}\n\nstruct C2 : I1<C2>\n{\n static I1<C2> I1<C2>.operator \" + op + @\"(I1<C2> x, int y) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (9,23): error CS0540: 'C1.I1<string>.operator %(I1<string>, int)': containing type does not implement interface 'I1<string>'\n // static I1<string> I1<string>.operator %(I1<string> x, int y) => default;\n Diagnostic(ErrorCode.ERR_ClassDoesntImplementInterface, \"I1<string>\").WithArguments(\"C1.I1<string>.operator \" + op + \"(I1<string>, int)\", \"I1<string>\").WithLocation(9, 23),\n // (12,8): error CS0452: The type 'C2' must be a reference type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // struct C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_RefConstraintNotSatisfied, \"C2\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(12, 8),\n // (14,19): error CS0452: The type 'C2' must be a reference type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator %(I1<C2> x, int y) => default;\n Diagnostic(ErrorCode.ERR_RefConstraintNotSatisfied, \"I1<C2>\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 19),\n // (14,35): error CS0452: The type 'C2' must be a reference type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator %(I1<C2> x, int y) => default;\n Diagnostic(ErrorCode.ERR_RefConstraintNotSatisfied, op).WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 35),\n // (14,44): error CS0452: The type 'C2' must be a reference type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static I1<C2> I1<C2>.operator %(I1<C2> x, int y) => default;\n Diagnostic(ErrorCode.ERR_RefConstraintNotSatisfied, \"x\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 44 + op.Length - 1)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_01(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n static int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n int I1.M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public static long M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n static long I1.M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1.M01'. 'C2.M01' cannot implement the interface member because it is not static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1\").WithArguments(\"C2\", \"I1.M01\", \"C2.M01\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01'. 'C3.M01' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01\", \"C3.M01\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01\").WithLocation(24, 10),\n // (26,12): error CS0539: 'C4.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01\").WithLocation(26, 12),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01'. 'C5.M01' cannot implement 'I1.M01' because it does not have the matching return type of 'int'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01\", \"C5.M01\", \"int\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01\").WithLocation(36, 10),\n // (38,20): error CS0539: 'C6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static long I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01\").WithLocation(38, 20)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_02(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public static int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n static int I1.M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public long M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n long I1.M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(8, 10),\n // (12,10): error CS0736: 'C2' does not implement instance interface member 'I1.M01'. 'C2.M01' cannot implement the interface member because it is static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberStatic, \"I1\").WithArguments(\"C2\", \"I1.M01\", \"C2.M01\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01'. 'C3.M01' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01\", \"C3.M01\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01\").WithLocation(24, 10),\n // (26,19): error CS0539: 'C4.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01\").WithLocation(26, 19),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01'. 'C5.M01' cannot implement 'I1.M01' because it does not have the matching return type of 'int'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01\", \"C5.M01\", \"int\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01\").WithLocation(36, 10),\n // (38,13): error CS0539: 'C6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // long I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01\").WithLocation(38, 13)\n );\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_03()\n {\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\ninterface I2 : I1\n{}\n\ninterface I3 : I1\n{\n public virtual int M01 { get => 0; set{} }\n}\n\ninterface I4 : I1\n{\n static int M01 { get; set; }\n}\n\ninterface I5 : I1\n{\n int I1.M01 { get => 0; set{} }\n}\n\ninterface I6 : I1\n{\n static int I1.M01 { get => 0; set{} }\n}\n\ninterface I7 : I1\n{\n abstract static int M01 { get; set; }\n}\n\ninterface I8 : I1\n{\n abstract static int I1.M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (12,24): warning CS0108: 'I3.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // public virtual int M01 { get => 0; set{} }\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I3.M01\", \"I1.M01\").WithLocation(12, 24),\n // (17,16): warning CS0108: 'I4.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // static int M01 { get; set; }\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I4.M01\", \"I1.M01\").WithLocation(17, 16),\n // (22,12): error CS0539: 'I5.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // int I1.M01 { get => 0; set{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I5.M01\").WithLocation(22, 12),\n // (27,19): error CS0106: The modifier 'static' is not valid for this item\n // static int I1.M01 { get => 0; set{} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(27, 19),\n // (27,19): error CS0539: 'I6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1.M01 { get => 0; set{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I6.M01\").WithLocation(27, 19),\n // (32,25): warning CS0108: 'I7.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I7.M01\", \"I1.M01\").WithLocation(32, 25),\n // (37,28): error CS0106: The modifier 'static' is not valid for this item\n // abstract static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(37, 28),\n // (37,28): error CS0539: 'I8.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I8.M01\").WithLocation(37, 28)\n );\n\n foreach (var m01 in compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers())\n {\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I8\").FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_04(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n abstract static int M02 { get; set; }\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test: I1\n{\n static int I1.M01 { get; set; }\n public static int M02 { get; set; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,19): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 19)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (4,19): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 19),\n // (10,25): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(10, 25),\n // (11,25): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static int M02 { get; set; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M02\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(11, 25)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_05(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n public static int M01 { get; set; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01.set' cannot implement interface member 'I1.M01.set' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.set\", \"I1.M01.set\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01.get' cannot implement interface member 'I1.M01.get' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.get\", \"I1.M01.get\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01' cannot implement interface member 'I1.M01' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01\", \"I1.M01\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01.set' cannot implement interface member 'I1.M01.set' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.set\", \"I1.M01.set\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01.get' cannot implement interface member 'I1.M01.get' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.get\", \"I1.M01.get\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01' cannot implement interface member 'I1.M01' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01\", \"I1.M01\", \"Test1\").WithLocation(2, 12),\n // (9,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(9, 31),\n // (9,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(9, 36)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_06(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static int I1.M01 { get; set; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,19): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 19)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (4,19): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 19),\n // (9,31): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"get\").WithLocation(9, 31),\n // (9,36): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static int M01 { get; set; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"set\").WithLocation(9, 36)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_07(bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n public static int M01 { get => 0; set {} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n var m01Set = m01.SetMethod;\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n Assert.False(cM01Get.HasRuntimeSpecialName);\n Assert.True(cM01Get.HasSpecialName);\n\n Assert.Equal(\"System.Int32 C.M01.get\", cM01Get.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n Assert.Same(cM01Set, c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n Assert.False(cM01Set.HasRuntimeSpecialName);\n Assert.True(cM01Set.HasSpecialName);\n\n Assert.Equal(\"void C.M01.set\", cM01Set.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Set, cM01Set.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Get.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Set.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticReadonlyProperty_07(bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; }\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n public static int M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n Assert.Null(m01.SetMethod);\n\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n\n Assert.Equal(\"System.Int32 C.M01.get\", cM01Get.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n\n Assert.Equal(\"void C.M01.set\", cM01Set.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Get.ExplicitInterfaceImplementations);\n }\n\n Assert.Empty(cM01Set.ExplicitInterfaceImplementations);\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_08(bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n static int I1.M01 { get => 0; set {} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n var m01Set = m01.SetMethod;\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C.I1.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n Assert.False(cM01Get.HasRuntimeSpecialName);\n Assert.True(cM01Get.HasSpecialName);\n\n Assert.Equal(\"System.Int32 C.I1.M01.get\", cM01Get.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n Assert.Same(cM01Set, c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n Assert.False(cM01Set.HasRuntimeSpecialName);\n Assert.True(cM01Set.HasSpecialName);\n\n Assert.Equal(\"void C.I1.M01.set\", cM01Set.ToTestDisplayString());\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Set, cM01Set.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_09()\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\npublic class C1\n{\n public static void M01() {}\n}\n\npublic class C2 : C1, I1\n{\n static int I1.M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<PropertySymbol>());\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n var cM01 = (PropertySymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"System.Int32 C2.I1.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n Assert.Same(cM01.GetMethod, c3.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(cM01.SetMethod, c3.FindImplementationForInterfaceMember(m01.SetMethod));\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, cM01.GetMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, cM01.SetMethod.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_10()\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n int32 get_M01 () cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void set_M01 (\n int32 'value'\n ) cil managed \n {\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void I1::set_M01(int32)\n }\n}\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements I1\n{\n .method private hidebysig specialname static\n int32 I1.get_M01 () cil managed \n {\n .override method int32 I1::get_M01()\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method private hidebysig specialname static\n void I1.set_M01 (\n int32 'value'\n ) cil managed \n {\n .override method void I1::set_M01(int32)\n IL_0000: ret\n }\n\n .property instance int32 I1.M01()\n {\n .get int32 C1::I1.get_M01()\n .set void C1::I1.set_M01(int32)\n }\n\n .method public hidebysig specialname static \n int32 get_M01 () cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig specialname static \n void set_M01 (\n int32 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .property int32 M01()\n {\n .get int32 C1::get_M01()\n .set void C1::set_M01(int32)\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: ret\n }\n}\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements I1\n{\n .method public hidebysig specialname static \n int32 get_M01 () cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig specialname static \n void set_M01 (\n int32 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .property int32 M01()\n {\n .get int32 C2::get_M01()\n .set void C2::set_M01(int32)\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n }\n}\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1\n{\n}\n\npublic class C5 : C2, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n var c1M01 = (PropertySymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"System.Int32 C1.I1.M01 { get; set; }\", c1M01.ToTestDisplayString());\n\n Assert.Same(c1M01.GetMethod, c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c1M01.SetMethod, c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, c1M01.GetMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, c1M01.SetMethod.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.GetMethod, c2.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c1M01.SetMethod, c2.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.GetMethod, c3.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c1M01.SetMethod, c3.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.GetMethod, c4.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c1M01.SetMethod, c4.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n var c2M01 = (PropertySymbol)c5.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"System.Int32 C2.M01 { get; set; }\", c2M01.ToTestDisplayString());\n Assert.Same(c2M01.GetMethod, c5.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c2M01.SetMethod, c5.FindImplementationForInterfaceMember(m01.SetMethod));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_11()\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n scenario1();\n scenario2();\n scenario3();\n\n void scenario1()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method private hidebysig specialname static virtual\n int32 get_M01 () cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method private hidebysig specialname static virtual\n void set_M01 (\n int32 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void I1::set_M01(int32)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { get; set; }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,18): error CS0539: 'C1.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 18)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { get; set; }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n Assert.Null(c.FindImplementationForInterfaceMember(m01));\n Assert.Null(c.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c.FindImplementationForInterfaceMember(m01.SetMethod));\n }\n }\n\n void scenario2()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n int32 get_M01 () cil managed \n {\n }\n\n .method private hidebysig specialname static virtual\n void set_M01 (\n int32 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void I1::set_M01(int32)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { get; }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate2, symbolValidator: validate2, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate2(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n var m01Set = m01.SetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.I1.M01 { get; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n\n Assert.Equal(\"System.Int32 C1.I1.M01.get\", cM01Get.ToTestDisplayString());\n\n Assert.Null(cM01.SetMethod);\n Assert.Null(c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n }\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { get; set; }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n\n Assert.Equal(\"System.Int32 C1.M01.get\", cM01Get.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n\n Assert.Equal(\"void C1.M01.set\", cM01Set.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.SetMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Get.ExplicitInterfaceImplementations);\n }\n\n Assert.Empty(cM01Set.ExplicitInterfaceImplementations);\n }\n\n var source4 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { get; set; }\n}\n\";\n\n var compilation4 = CreateCompilationWithIL(source4, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation4.VerifyDiagnostics(\n // (4,29): error CS0550: 'C1.I1.M01.set' adds an accessor not found in interface member 'I1.M01'\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"set\").WithArguments(\"C1.I1.M01.set\", \"I1.M01\").WithLocation(4, 29)\n );\n\n c1 = compilation4.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n var c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.GetMethod, c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, c1M01.GetMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, c1M01.SetMethod.ExplicitInterfaceImplementations.Single());\n\n var source5 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { get; }\n}\n\";\n\n var compilation5 = CreateCompilationWithIL(source5, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation5, sourceSymbolValidator: validate5, symbolValidator: validate5, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate5(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.M01 { get; }\", cM01.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n Assert.Same(cM01Get, c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n\n Assert.Equal(\"System.Int32 C1.M01.get\", cM01Get.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.SetMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Get, cM01Get.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Get.ExplicitInterfaceImplementations);\n }\n }\n\n var source6 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { set{} }\n}\n\";\n\n var compilation6 = CreateCompilationWithIL(source6, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation6.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.get'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.get\").WithLocation(2, 19)\n );\n\n c1 = compilation6.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var source7 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { set{} }\n}\n\";\n\n var compilation7 = CreateCompilationWithIL(source7, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation7.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.get'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.get\").WithLocation(2, 19),\n // (4,18): error CS0551: Explicit interface implementation 'C1.I1.M01' is missing accessor 'I1.M01.get'\n // static int I1.M01 { set{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyMissingAccessor, \"M01\").WithArguments(\"C1.I1.M01\", \"I1.M01.get\").WithLocation(4, 18),\n // (4,24): error CS0550: 'C1.I1.M01.set' adds an accessor not found in interface member 'I1.M01'\n // static int I1.M01 { set{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"set\").WithArguments(\"C1.I1.M01.set\", \"I1.M01\").WithLocation(4, 24)\n );\n\n c1 = compilation7.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, c1M01.SetMethod.ExplicitInterfaceImplementations.Single());\n }\n\n void scenario3()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method private hidebysig specialname static virtual\n int32 get_M01 () cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig specialname abstract virtual static \n void set_M01 (\n int32 'value'\n ) cil managed \n {\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void I1::set_M01(int32)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { set{} }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate2, symbolValidator: validate2, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate2(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Get = m01.GetMethod;\n var m01Set = m01.SetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.I1.M01 { set; }\", cM01.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n Assert.Same(cM01Set, c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n\n Assert.Equal(\"void C1.I1.M01.set\", cM01Set.ToTestDisplayString());\n\n Assert.Null(cM01.GetMethod);\n Assert.Null(c.FindImplementationForInterfaceMember(m01Get));\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Set, cM01Set.ExplicitInterfaceImplementations.Single());\n }\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { get; set; }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Set = m01.SetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.M01 { get; set; }\", cM01.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n Assert.Same(cM01Set, c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n\n Assert.Equal(\"void C1.M01.set\", cM01Set.ToTestDisplayString());\n\n var cM01Get = cM01.GetMethod;\n\n Assert.True(cM01Get.IsStatic);\n Assert.False(cM01Get.IsAbstract);\n Assert.False(cM01Get.IsVirtual);\n Assert.False(cM01Get.IsMetadataVirtual());\n Assert.False(cM01Get.IsMetadataFinal);\n Assert.False(cM01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, cM01Get.MethodKind);\n\n Assert.Equal(\"System.Int32 C1.M01.get\", cM01Get.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.GetMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Set, cM01Set.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Set.ExplicitInterfaceImplementations);\n }\n\n Assert.Empty(cM01Get.ExplicitInterfaceImplementations);\n }\n\n var source4 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { get; set; }\n}\n\";\n\n var compilation4 = CreateCompilationWithIL(source4, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation4.VerifyDiagnostics(\n // (4,24): error CS0550: 'C1.I1.M01.get' adds an accessor not found in interface member 'I1.M01'\n // static int I1.M01 { get; set; }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"get\").WithArguments(\"C1.I1.M01.get\", \"I1.M01\").WithLocation(4, 24)\n );\n\n c1 = compilation4.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n var c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.SetMethod, c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, c1M01.GetMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, c1M01.SetMethod.ExplicitInterfaceImplementations.Single());\n\n var source5 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { set{} }\n}\n\";\n\n var compilation5 = CreateCompilationWithIL(source5, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation5, sourceSymbolValidator: validate5, symbolValidator: validate5, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate5(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n var m01Set = m01.SetMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<PropertySymbol>().Count());\n Assert.Equal(1, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (PropertySymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.M01 { set; }\", cM01.ToTestDisplayString());\n\n var cM01Set = cM01.SetMethod;\n Assert.Same(cM01Set, c.FindImplementationForInterfaceMember(m01Set));\n\n Assert.True(cM01Set.IsStatic);\n Assert.False(cM01Set.IsAbstract);\n Assert.False(cM01Set.IsVirtual);\n Assert.False(cM01Set.IsMetadataVirtual());\n Assert.False(cM01Set.IsMetadataFinal);\n Assert.False(cM01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, cM01Set.MethodKind);\n\n Assert.Equal(\"void C1.M01.set\", cM01Set.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.GetMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Set, cM01Set.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Set.ExplicitInterfaceImplementations);\n }\n }\n\n var source6 =\n@\"\npublic class C1 : I1\n{\n public static int M01 { get; }\n}\n\";\n\n var compilation6 = CreateCompilationWithIL(source6, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation6.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.set'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.set\").WithLocation(2, 19)\n );\n\n c1 = compilation6.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var source7 =\n@\"\npublic class C1 : I1\n{\n static int I1.M01 { get; }\n}\n\";\n\n var compilation7 = CreateCompilationWithIL(source7, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation7.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.set'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.set\").WithLocation(2, 19),\n // (4,18): error CS0551: Explicit interface implementation 'C1.I1.M01' is missing accessor 'I1.M01.set'\n // static int I1.M01 { get; }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyMissingAccessor, \"M01\").WithArguments(\"C1.I1.M01\", \"I1.M01.set\").WithLocation(4, 18),\n // (4,24): error CS0550: 'C1.I1.M01.get' adds an accessor not found in interface member 'I1.M01'\n // static int I1.M01 { get; }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"get\").WithArguments(\"C1.I1.M01.get\", \"I1.M01\").WithLocation(4, 24)\n );\n\n c1 = compilation7.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n c1M01 = c1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, c1M01.GetMethod.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_12()\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n int32 get_M01 () cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void set_M01 (\n int32 'value'\n ) cil managed \n {\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void I1::set_M01(int32)\n }\n}\n\n.class interface public auto ansi abstract I2\n implements I1\n{\n .method private hidebysig specialname static\n int32 I1.get_M01 () cil managed \n {\n .override method int32 I1::get_M01()\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method private hidebysig specialname static\n void I1.set_M01 (\n int32 'value'\n ) cil managed \n {\n .override method void I1::set_M01(int32)\n IL_0000: ret\n }\n\n .property instance int32 I1.M01()\n {\n .get int32 I2::I1.get_M01()\n .set void I2::I1.set_M01(int32)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I2\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I2\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.SetMethod));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01.SetMethod));\n\n var i2M01 = i2.GetMembers().OfType<PropertySymbol>().Single();\n Assert.Same(m01, i2M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.GetMethod, i2M01.GetMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.SetMethod, i2M01.SetMethod.ExplicitInterfaceImplementations.Single());\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_13()\n {\n // A forwarding method is added for an implicit implementation declared in base class. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\nclass C1\n{\n public static int M01 { get; set; }\n}\n\nclass C2 : C1, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<PropertySymbol>().Single();\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (PropertySymbol)c2.FindImplementationForInterfaceMember(m01);\n var c2M01Get = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01.GetMethod);\n var c2M01Set = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01.SetMethod);\n\n Assert.True(c2M01Get.IsStatic);\n Assert.False(c2M01Get.IsAbstract);\n Assert.False(c2M01Get.IsVirtual);\n Assert.False(c2M01Get.IsMetadataVirtual());\n Assert.False(c2M01Get.IsMetadataFinal);\n Assert.False(c2M01Get.IsMetadataNewSlot());\n\n Assert.True(c2M01Set.IsStatic);\n Assert.False(c2M01Set.IsAbstract);\n Assert.False(c2M01Set.IsVirtual);\n Assert.False(c2M01Set.IsMetadataVirtual());\n Assert.False(c2M01Set.IsMetadataFinal);\n Assert.False(c2M01Set.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01Get.MethodKind);\n Assert.False(c2M01Get.HasRuntimeSpecialName);\n Assert.False(c2M01Get.HasSpecialName);\n Assert.Equal(\"System.Int32 C2.I1.get_M01()\", c2M01Get.ToTestDisplayString());\n Assert.Same(m01.GetMethod, c2M01Get.ExplicitInterfaceImplementations.Single());\n\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01Set.MethodKind);\n Assert.False(c2M01Set.HasRuntimeSpecialName);\n Assert.False(c2M01Set.HasSpecialName);\n Assert.Equal(\"void C2.I1.set_M01(System.Int32 value)\", c2M01Set.ToTestDisplayString());\n Assert.Same(m01.SetMethod, c2M01Set.ExplicitInterfaceImplementations.Single());\n\n // Forwarding methods for accessors aren't tied to a property\n Assert.Null(c2M01);\n\n var c1M01 = module.GlobalNamespace.GetMember<PropertySymbol>(\"C1.M01\");\n var c1M01Get = c1M01.GetMethod;\n var c1M01Set = c1M01.SetMethod;\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n Assert.True(c1M01Get.IsStatic);\n Assert.False(c1M01Get.IsAbstract);\n Assert.False(c1M01Get.IsVirtual);\n Assert.False(c1M01Get.IsMetadataVirtual());\n Assert.False(c1M01Get.IsMetadataFinal);\n Assert.False(c1M01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, c1M01Get.MethodKind);\n Assert.False(c1M01Get.HasRuntimeSpecialName);\n Assert.True(c1M01Get.HasSpecialName);\n Assert.Empty(c1M01Get.ExplicitInterfaceImplementations);\n\n Assert.True(c1M01Set.IsStatic);\n Assert.False(c1M01Set.IsAbstract);\n Assert.False(c1M01Set.IsVirtual);\n Assert.False(c1M01Set.IsMetadataVirtual());\n Assert.False(c1M01Set.IsMetadataFinal);\n Assert.False(c1M01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, c1M01Set.MethodKind);\n Assert.False(c1M01Set.HasRuntimeSpecialName);\n Assert.True(c1M01Set.HasSpecialName);\n Assert.Empty(c1M01Set.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n\n Assert.Equal(\"System.Int32 C1.M01 { get; set; }\", c2M01.ToTestDisplayString());\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n Assert.Equal(MethodKind.PropertyGet, c2M01Get.MethodKind);\n Assert.False(c2M01Get.HasRuntimeSpecialName);\n Assert.True(c2M01Get.HasSpecialName);\n Assert.Same(c2M01.GetMethod, c2M01Get);\n Assert.Empty(c2M01Get.ExplicitInterfaceImplementations);\n\n Assert.Equal(MethodKind.PropertySet, c2M01Set.MethodKind);\n Assert.False(c2M01Set.HasRuntimeSpecialName);\n Assert.True(c2M01Set.HasSpecialName);\n Assert.Same(c2M01.SetMethod, c2M01Set);\n Assert.Empty(c2M01Set.ExplicitInterfaceImplementations);\n }\n }\n\n verifier.VerifyIL(\"C2.I1.get_M01\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 1\n IL_0000: call \"\"int C1.M01.get\"\"\n IL_0005: ret\n}\n\");\n\n verifier.VerifyIL(\"C2.I1.set_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.set\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_14()\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n int32 get_M01 () cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void modopt(I1) set_M01 (\n int32 modopt(I1) 'value'\n ) cil managed \n {\n }\n\n .property int32 M01()\n {\n .get int32 I1::get_M01()\n .set void modopt(I1) I1::set_M01(int32 modopt(I1))\n }\n}\n\n.class interface public auto ansi abstract I2\n{\n .method public hidebysig specialname abstract virtual static \n int32 modopt(I2) get_M01 () cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void set_M01 (\n int32 modopt(I2) 'value'\n ) cil managed \n {\n }\n\n .property int32 modopt(I2) M01()\n {\n .get int32 modopt(I2) I2::get_M01()\n .set void I2::set_M01(int32 modopt(I2))\n }\n}\n\";\n\n var source1 =\n@\"\nclass C1 : I1\n{\n public static int M01 { get; set; }\n}\n\nclass C2 : I1\n{\n static int I1.M01 { get; set; }\n}\n\nclass C3 : I2\n{\n static int I2.M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n var c1M01 = (PropertySymbol)c1.FindImplementationForInterfaceMember(m01);\n var c1M01Get = c1M01.GetMethod;\n var c1M01Set = c1M01.SetMethod;\n\n Assert.Equal(\"System.Int32 C1.M01 { get; set; }\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n\n Assert.Equal(MethodKind.PropertyGet, c1M01Get.MethodKind);\n Assert.Equal(\"System.Int32 C1.M01.get\", c1M01Get.ToTestDisplayString());\n Assert.True(c1M01Get.IsStatic);\n Assert.False(c1M01Get.IsAbstract);\n Assert.False(c1M01Get.IsVirtual);\n Assert.False(c1M01Get.IsMetadataVirtual());\n Assert.False(c1M01Get.IsMetadataFinal);\n Assert.False(c1M01Get.IsMetadataNewSlot());\n Assert.Same(c1M01Get, c1.FindImplementationForInterfaceMember(m01.GetMethod));\n\n Assert.Equal(MethodKind.PropertySet, c1M01Set.MethodKind);\n Assert.Equal(\"void C1.M01.set\", c1M01Set.ToTestDisplayString());\n Assert.Empty(c1M01Set.ExplicitInterfaceImplementations);\n Assert.True(c1M01Set.IsStatic);\n Assert.False(c1M01Set.IsAbstract);\n Assert.False(c1M01Set.IsVirtual);\n Assert.False(c1M01Set.IsMetadataVirtual());\n Assert.False(c1M01Set.IsMetadataFinal);\n Assert.False(c1M01Set.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01.GetMethod, c1M01Get.ExplicitInterfaceImplementations.Single());\n\n c1M01Set = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01.SetMethod);\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01Set.MethodKind);\n Assert.Equal(\"void modopt(I1) C1.I1.set_M01(System.Int32 modopt(I1) value)\", c1M01Set.ToTestDisplayString());\n Assert.Same(m01.SetMethod, c1M01Set.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c1M01Set.IsStatic);\n Assert.False(c1M01Set.IsAbstract);\n Assert.False(c1M01Set.IsVirtual);\n Assert.False(c1M01Set.IsMetadataVirtual());\n Assert.False(c1M01Set.IsMetadataFinal);\n Assert.False(c1M01Set.IsMetadataNewSlot());\n }\n else\n {\n Assert.Empty(c1M01Get.ExplicitInterfaceImplementations);\n Assert.Same(c1M01Set, c1.FindImplementationForInterfaceMember(m01.SetMethod));\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (PropertySymbol)c2.FindImplementationForInterfaceMember(m01);\n var c2M01Get = c2M01.GetMethod;\n var c2M01Set = c2M01.SetMethod;\n\n Assert.Equal(\"System.Int32 C2.I1.M01 { get; set; }\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.Same(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c2M01Get.IsStatic);\n Assert.False(c2M01Get.IsAbstract);\n Assert.False(c2M01Get.IsVirtual);\n Assert.False(c2M01Get.IsMetadataVirtual());\n Assert.False(c2M01Get.IsMetadataFinal);\n Assert.False(c2M01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, c2M01Get.MethodKind);\n Assert.Equal(\"System.Int32 C2.I1.M01.get\", c2M01Get.ToTestDisplayString());\n Assert.Same(m01.GetMethod, c2M01Get.ExplicitInterfaceImplementations.Single());\n Assert.Same(c2M01Get, c2.FindImplementationForInterfaceMember(m01.GetMethod));\n\n Assert.True(c2M01Set.IsStatic);\n Assert.False(c2M01Set.IsAbstract);\n Assert.False(c2M01Set.IsVirtual);\n Assert.False(c2M01Set.IsMetadataVirtual());\n Assert.False(c2M01Set.IsMetadataFinal);\n Assert.False(c2M01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, c2M01Set.MethodKind);\n Assert.Equal(\"void modopt(I1) C2.I1.M01.set\", c2M01Set.ToTestDisplayString());\n Assert.Equal(\"System.Int32 modopt(I1) value\", c2M01Set.Parameters.Single().ToTestDisplayString());\n Assert.Same(m01.SetMethod, c2M01Set.ExplicitInterfaceImplementations.Single());\n Assert.Same(c2M01Set, c2.FindImplementationForInterfaceMember(m01.SetMethod));\n\n Assert.Same(c2M01, c2.GetMembers().OfType<PropertySymbol>().Single());\n Assert.Equal(2, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n m01 = c3.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n var c3M01 = (PropertySymbol)c3.FindImplementationForInterfaceMember(m01);\n var c3M01Get = c3M01.GetMethod;\n var c3M01Set = c3M01.SetMethod;\n\n Assert.Equal(\"System.Int32 modopt(I2) C3.I2.M01 { get; set; }\", c3M01.ToTestDisplayString());\n\n Assert.True(c3M01.IsStatic);\n Assert.False(c3M01.IsAbstract);\n Assert.False(c3M01.IsVirtual);\n Assert.Same(m01, c3M01.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c3M01Get.IsStatic);\n Assert.False(c3M01Get.IsAbstract);\n Assert.False(c3M01Get.IsVirtual);\n Assert.False(c3M01Get.IsMetadataVirtual());\n Assert.False(c3M01Get.IsMetadataFinal);\n Assert.False(c3M01Get.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertyGet, c3M01Get.MethodKind);\n Assert.Equal(\"System.Int32 modopt(I2) C3.I2.M01.get\", c3M01Get.ToTestDisplayString());\n Assert.Same(m01.GetMethod, c3M01Get.ExplicitInterfaceImplementations.Single());\n Assert.Same(c3M01Get, c3.FindImplementationForInterfaceMember(m01.GetMethod));\n\n\n Assert.True(c3M01Set.IsStatic);\n Assert.False(c3M01Set.IsAbstract);\n Assert.False(c3M01Set.IsVirtual);\n Assert.False(c3M01Set.IsMetadataVirtual());\n Assert.False(c3M01Set.IsMetadataFinal);\n Assert.False(c3M01Set.IsMetadataNewSlot());\n Assert.Equal(MethodKind.PropertySet, c3M01Set.MethodKind);\n Assert.Equal(\"void C3.I2.M01.set\", c3M01Set.ToTestDisplayString());\n Assert.Equal(\"System.Int32 modopt(I2) value\", c3M01Set.Parameters.Single().ToTestDisplayString());\n Assert.Same(m01.SetMethod, c3M01Set.ExplicitInterfaceImplementations.Single());\n Assert.Same(c3M01Set, c3.FindImplementationForInterfaceMember(m01.SetMethod));\n\n Assert.Same(c3M01, c3.GetMembers().OfType<PropertySymbol>().Single());\n Assert.Equal(2, c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n }\n\n verifier.VerifyIL(\"C1.I1.set_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.set\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStatiProperty_15()\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n abstract static int M02 { get; set; }\n}\n\npublic class C1\n{\n public static int M01 { get; set; }\n}\n\npublic class C2 : C1, I1\n{\n static int I1.M02 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<PropertySymbol>());\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(\"M01\").OfType<PropertySymbol>().Single();\n\n var c1M01 = c3.BaseType().BaseType().GetMember<PropertySymbol>(\"M01\");\n Assert.Equal(\"System.Int32 C1.M01 { get; set; }\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n var c1M01Get = c1M01.GetMethod;\n Assert.True(c1M01Get.IsStatic);\n Assert.False(c1M01Get.IsAbstract);\n Assert.False(c1M01Get.IsVirtual);\n Assert.False(c1M01Get.IsMetadataVirtual());\n Assert.False(c1M01Get.IsMetadataFinal);\n Assert.False(c1M01Get.IsMetadataNewSlot());\n\n Assert.Empty(c1M01Get.ExplicitInterfaceImplementations);\n\n var c1M01Set = c1M01.SetMethod;\n Assert.True(c1M01Set.IsStatic);\n Assert.False(c1M01Set.IsAbstract);\n Assert.False(c1M01Set.IsVirtual);\n Assert.False(c1M01Set.IsMetadataVirtual());\n Assert.False(c1M01Set.IsMetadataFinal);\n Assert.False(c1M01Set.IsMetadataNewSlot());\n\n Assert.Empty(c1M01Set.ExplicitInterfaceImplementations);\n\n if (c1M01.ContainingModule is PEModuleSymbol)\n {\n var c2M01Get = c3.FindImplementationForInterfaceMember(m01.GetMethod);\n Assert.Equal(\"System.Int32 C2.I1.get_M01()\", c2M01Get.ToTestDisplayString());\n\n var c2M01Set = c3.FindImplementationForInterfaceMember(m01.SetMethod);\n Assert.Equal(\"void C2.I1.set_M01(System.Int32 value)\", c2M01Set.ToTestDisplayString());\n\n // Forwarding methods for accessors aren't tied to a property\n Assert.Null(c3.FindImplementationForInterfaceMember(m01));\n }\n else\n {\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.GetMethod, c3.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c1M01.SetMethod, c3.FindImplementationForInterfaceMember(m01.SetMethod));\n }\n\n var m02 = c3.Interfaces().Single().GetMembers(\"M02\").OfType<PropertySymbol>().Single();\n\n var c2M02 = c3.BaseType().GetMember<PropertySymbol>(\"I1.M02\");\n Assert.Equal(\"System.Int32 C2.I1.M02 { get; set; }\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n Assert.Same(c2M02.GetMethod, c3.FindImplementationForInterfaceMember(m02.GetMethod));\n Assert.Same(c2M02.SetMethod, c3.FindImplementationForInterfaceMember(m02.SetMethod));\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticProperty_16()\n {\n // A new implicit implementation is properly considered.\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\npublic class C1 : I1\n{\n public static int M01 { get; set; }\n}\n\npublic class C2 : C1\n{\n new public static int M01 { get; set; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n var verifier = CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"C3.I1.get_M01\",\n@\"\n{\n // Code size 6 (0x6)\n .maxstack 1\n IL_0000: call \"\"int C2.M01.get\"\"\n IL_0005: ret\n}\n\");\n\n verifier.VerifyIL(\"C3.I1.set_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C2.M01.set\"\"\n IL_0006: ret\n}\n\");\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n var m01 = c3.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n var c2M01 = c3.BaseType().GetMember<PropertySymbol>(\"M01\");\n var c2M01Get = c2M01.GetMethod;\n var c2M01Set = c2M01.SetMethod;\n Assert.Equal(\"System.Int32 C2.M01 { get; set; }\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n Assert.True(c2M01Get.IsStatic);\n Assert.False(c2M01Get.IsAbstract);\n Assert.False(c2M01Get.IsVirtual);\n Assert.False(c2M01Get.IsMetadataVirtual());\n Assert.False(c2M01Get.IsMetadataFinal);\n Assert.False(c2M01Get.IsMetadataNewSlot());\n Assert.Empty(c2M01Get.ExplicitInterfaceImplementations);\n\n Assert.True(c2M01Set.IsStatic);\n Assert.False(c2M01Set.IsAbstract);\n Assert.False(c2M01Set.IsVirtual);\n Assert.False(c2M01Set.IsMetadataVirtual());\n Assert.False(c2M01Set.IsMetadataFinal);\n Assert.False(c2M01Set.IsMetadataNewSlot());\n Assert.Empty(c2M01Set.ExplicitInterfaceImplementations);\n\n if (module is PEModuleSymbol)\n {\n var c3M01 = (PropertySymbol)c3.FindImplementationForInterfaceMember(m01);\n // Forwarding methods for accessors aren't tied to a property\n Assert.Null(c3M01);\n\n var c3M01Get = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01.GetMethod);\n Assert.Equal(\"System.Int32 C3.I1.get_M01()\", c3M01Get.ToTestDisplayString());\n Assert.Same(m01.GetMethod, c3M01Get.ExplicitInterfaceImplementations.Single());\n\n var c3M01Set = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01.SetMethod);\n Assert.Equal(\"void C3.I1.set_M01(System.Int32 value)\", c3M01Set.ToTestDisplayString());\n Assert.Same(m01.SetMethod, c3M01Set.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c2M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c2M01Get, c3.FindImplementationForInterfaceMember(m01.GetMethod));\n Assert.Same(c2M01Set, c3.FindImplementationForInterfaceMember(m01.SetMethod));\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_19(bool genericFirst)\n {\n // An \"ambiguity\" in implicit/explicit implementation declared in generic base class.\n\n var generic =\n@\"\n public static T M01 { get; set; }\n\";\n var nonGeneric =\n@\"\n static int I1.M01 { get; set; }\n\";\n var source1 =\n@\"\npublic interface I1\n{\n abstract static int M01 { get; set; }\n}\n\npublic class C1<T> : I1\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().OfType<PropertySymbol>().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (PropertySymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"System.Int32 C1<T>.I1.M01 { get; set; }\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticProperty_20(bool genericFirst)\n {\n // Same as ImplementAbstractStaticProperty_19 only interface is generic too.\n\n var generic =\n@\"\n static T I1<T>.M01 { get; set; }\n\";\n var nonGeneric =\n@\"\n public static int M01 { get; set; }\n\";\n var source1 =\n@\"\npublic interface I1<T>\n{\n abstract static T M01 { get; set; }\n}\n\npublic class C1<T> : I1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().OfType<PropertySymbol>().Where(m => m.Name.Contains(\"M01\")).Count());\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1<int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<PropertySymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (PropertySymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"T C1<T>.I1<T>.M01 { get; set; }\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_01(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"#pragma warning disable CS0067 // WRN_UnreferencedEvent\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n static event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n event System.Action I1.M01 { add{} remove{}}\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public static event System.Action<int> M01;\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n static event System.Action<int> I1.M01 { add{} remove{}}\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1.M01'. 'C2.M01' cannot implement the interface member because it is not static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1\").WithArguments(\"C2\", \"I1.M01\", \"C2.M01\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01'. 'C3.M01' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01\", \"C3.M01\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01\").WithLocation(24, 10),\n // (26,28): error CS0539: 'C4.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // event System.Action I1.M01 { add{} remove{}}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01\").WithLocation(26, 28),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01'. 'C5.M01' cannot implement 'I1.M01' because it does not have the matching return type of 'Action'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01\", \"C5.M01\", \"System.Action\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01\").WithLocation(36, 10),\n // (38,40): error CS0539: 'C6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static event System.Action<int> I1.M01 { add{} remove{}}\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01\").WithLocation(38, 40)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_02(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"#pragma warning disable CS0067 // WRN_UnreferencedEvent\npublic interface I1\n{\n abstract event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C1 : I1\n{}\n\n\" + typeKeyword + @\"\n C2 : I1\n{\n public static event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C3 : I1\n{\n event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C4 : I1\n{\n static event System.Action I1.M01 { add{} remove{} }\n}\n\n\" + typeKeyword + @\"\n C5 : I1\n{\n public event System.Action<int> M01;\n}\n\n\" + typeKeyword + @\"\n C6 : I1\n{\n event System.Action<int> I1.M01 { add{} remove{} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(8, 10),\n // (12,10): error CS0736: 'C2' does not implement instance interface member 'I1.M01'. 'C2.M01' cannot implement the interface member because it is static.\n // C2 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberStatic, \"I1\").WithArguments(\"C2\", \"I1.M01\", \"C2.M01\").WithLocation(12, 10),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1.M01'. 'C3.M01' cannot implement an interface member because it is not public.\n // C3 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1\").WithArguments(\"C3\", \"I1.M01\", \"C3.M01\").WithLocation(18, 10),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1.M01'\n // C4 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C4\", \"I1.M01\").WithLocation(24, 10),\n // (26,35): error CS0539: 'C4.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C4.M01\").WithLocation(26, 35),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1.M01'. 'C5.M01' cannot implement 'I1.M01' because it does not have the matching return type of 'Action'.\n // C5 : I1\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1\").WithArguments(\"C5\", \"I1.M01\", \"C5.M01\", \"System.Action\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1.M01'\n // C6 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C6\", \"I1.M01\").WithLocation(36, 10),\n // (38,33): error CS0539: 'C6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // event System.Action<int> I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C6.M01\").WithLocation(38, 33)\n );\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_03()\n {\n var source1 =\n@\"#pragma warning disable CS0067 // WRN_UnreferencedEvent\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\ninterface I2 : I1\n{}\n\ninterface I3 : I1\n{\n public virtual event System.Action M01 { add{} remove{} }\n}\n\ninterface I4 : I1\n{\n static event System.Action M01;\n}\n\ninterface I5 : I1\n{\n event System.Action I1.M01 { add{} remove{} }\n}\n\ninterface I6 : I1\n{\n static event System.Action I1.M01 { add{} remove{} }\n}\n\ninterface I7 : I1\n{\n abstract static event System.Action M01;\n}\n\ninterface I8 : I1\n{\n abstract static event System.Action I1.M01;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (12,40): warning CS0108: 'I3.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // public virtual event System.Action M01 { add{} remove{} }\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I3.M01\", \"I1.M01\").WithLocation(12, 40),\n // (17,32): warning CS0108: 'I4.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // static event System.Action M01;\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I4.M01\", \"I1.M01\").WithLocation(17, 32),\n // (22,28): error CS0539: 'I5.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I5.M01\").WithLocation(22, 28),\n // (27,35): error CS0106: The modifier 'static' is not valid for this item\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(27, 35),\n // (27,35): error CS0539: 'I6.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I6.M01\").WithLocation(27, 35),\n // (32,41): warning CS0108: 'I7.M01' hides inherited member 'I1.M01'. Use the new keyword if hiding was intended.\n // abstract static event System.Action M01;\n Diagnostic(ErrorCode.WRN_NewRequired, \"M01\").WithArguments(\"I7.M01\", \"I1.M01\").WithLocation(32, 41),\n // (37,44): error CS0106: The modifier 'static' is not valid for this item\n // abstract static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"M01\").WithArguments(\"static\").WithLocation(37, 44),\n // (37,44): error CS0539: 'I8.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static event System.Action I1.M01;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"I8.M01\").WithLocation(37, 44)\n );\n\n foreach (var m01 in compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers())\n {\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I8\").FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_04(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n abstract static event System.Action M02;\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test: I1\n{\n static event System.Action I1.M01 { add{} remove => throw null; }\n public static event System.Action M02;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,35): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static event System.Action I1.M01 { add{} remove => throw null; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 35),\n // (5,39): warning CS0067: The event 'Test.M02' is never used\n // public static event System.Action M02;\n Diagnostic(ErrorCode.WRN_UnreferencedEvent, \"M02\").WithArguments(\"Test.M02\").WithLocation(5, 39)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (4,35): error CS8703: The modifier 'static' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // static event System.Action I1.M01 { add{} remove => throw null; }\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"static\", \"9.0\", \"preview\").WithLocation(4, 35),\n // (5,39): warning CS0067: The event 'Test.M02' is never used\n // public static event System.Action M02;\n Diagnostic(ErrorCode.WRN_UnreferencedEvent, \"M02\").WithArguments(\"Test.M02\").WithLocation(5, 39),\n // (10,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event System.Action M01;\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M01\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(10, 41),\n // (11,41): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static event System.Action M02;\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"M02\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(11, 41)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_05(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n public static event System.Action M01 { add{} remove{} }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01.remove' cannot implement interface member 'I1.M01.remove' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.remove\", \"I1.M01.remove\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01.add' cannot implement interface member 'I1.M01.add' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.add\", \"I1.M01.add\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01' cannot implement interface member 'I1.M01' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01\", \"I1.M01\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.M01.remove' cannot implement interface member 'I1.M01.remove' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.remove\", \"I1.M01.remove\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01.add' cannot implement interface member 'I1.M01.add' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01.add\", \"I1.M01.add\", \"Test1\").WithLocation(2, 12),\n // (2,12): error CS8929: 'Test1.M01' cannot implement interface member 'I1.M01' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1\").WithArguments(\"Test1.M01\", \"I1.M01\", \"Test1\").WithLocation(2, 12),\n // (9,41): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static event System.Action M01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(9, 41)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_06(bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1\n{\n static event System.Action I1.M01 { add => throw null; remove => throw null; }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static event System.Action I1.M01 { add => throw null; remove => throw null; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 35)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (4,35): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static event System.Action I1.M01 { add => throw null; remove => throw null; }\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(4, 35),\n // (9,41): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static event System.Action M01;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"M01\").WithLocation(9, 41)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_07(bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n public static event System.Action M01 { add => throw null; remove {} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<EventSymbol>().Single();\n var m01Add = m01.AddMethod;\n var m01Remove = m01.RemoveMethod;\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<EventSymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (EventSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"event System.Action C.M01\", cM01.ToTestDisplayString());\n\n var cM01Add = cM01.AddMethod;\n Assert.Same(cM01Add, c.FindImplementationForInterfaceMember(m01Add));\n\n Assert.True(cM01Add.IsStatic);\n Assert.False(cM01Add.IsAbstract);\n Assert.False(cM01Add.IsVirtual);\n Assert.False(cM01Add.IsMetadataVirtual());\n Assert.False(cM01Add.IsMetadataFinal);\n Assert.False(cM01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, cM01Add.MethodKind);\n Assert.False(cM01Add.HasRuntimeSpecialName);\n Assert.True(cM01Add.HasSpecialName);\n\n Assert.Equal(\"void C.M01.add\", cM01Add.ToTestDisplayString());\n\n var cM01Remove = cM01.RemoveMethod;\n Assert.Same(cM01Remove, c.FindImplementationForInterfaceMember(m01Remove));\n\n Assert.True(cM01Remove.IsStatic);\n Assert.False(cM01Remove.IsAbstract);\n Assert.False(cM01Remove.IsVirtual);\n Assert.False(cM01Remove.IsMetadataVirtual());\n Assert.False(cM01Remove.IsMetadataFinal);\n Assert.False(cM01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, cM01Remove.MethodKind);\n Assert.False(cM01Remove.HasRuntimeSpecialName);\n Assert.True(cM01Remove.HasSpecialName);\n\n Assert.Equal(\"void C.M01.remove\", cM01Remove.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Add, cM01Add.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Remove, cM01Remove.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Add.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Remove.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_08(bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\n\" + typeKeyword + @\"\n C : I1\n{\n static event System.Action I1.M01 { add => throw null; remove {} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<EventSymbol>().Single();\n var m01Add = m01.AddMethod;\n var m01Remove = m01.RemoveMethod;\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n\n Assert.Equal(1, c.GetMembers().OfType<EventSymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (EventSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"event System.Action C.I1.M01\", cM01.ToTestDisplayString());\n\n var cM01Add = cM01.AddMethod;\n Assert.Same(cM01Add, c.FindImplementationForInterfaceMember(m01Add));\n\n Assert.True(cM01Add.IsStatic);\n Assert.False(cM01Add.IsAbstract);\n Assert.False(cM01Add.IsVirtual);\n Assert.False(cM01Add.IsMetadataVirtual());\n Assert.False(cM01Add.IsMetadataFinal);\n Assert.False(cM01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, cM01Add.MethodKind);\n Assert.False(cM01Add.HasRuntimeSpecialName);\n Assert.True(cM01Add.HasSpecialName);\n\n Assert.Equal(\"void C.I1.M01.add\", cM01Add.ToTestDisplayString());\n\n var cM01Remove = cM01.RemoveMethod;\n Assert.Same(cM01Remove, c.FindImplementationForInterfaceMember(m01Remove));\n\n Assert.True(cM01Remove.IsStatic);\n Assert.False(cM01Remove.IsAbstract);\n Assert.False(cM01Remove.IsVirtual);\n Assert.False(cM01Remove.IsMetadataVirtual());\n Assert.False(cM01Remove.IsMetadataFinal);\n Assert.False(cM01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, cM01Remove.MethodKind);\n Assert.False(cM01Remove.HasRuntimeSpecialName);\n Assert.True(cM01Remove.HasSpecialName);\n\n Assert.Equal(\"void C.I1.M01.remove\", cM01Remove.ToTestDisplayString());\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Add, cM01Add.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01Remove, cM01Remove.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_09()\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\npublic class C1\n{\n public static event System.Action M01 { add => throw null; remove {} }\n}\n\npublic class C2 : C1, I1\n{\n static event System.Action I1.M01 { add => throw null; remove {} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<EventSymbol>());\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n var cM01 = (EventSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"event System.Action C2.I1.M01\", cM01.ToTestDisplayString());\n\n Assert.Same(cM01.AddMethod, c3.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(cM01.RemoveMethod, c3.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n Assert.Same(m01, cM01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, cM01.AddMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, cM01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_10()\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action)\n .removeon void I1::remove_M01(class [mscorlib]System.Action)\n }\n}\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements I1\n{\n .method private hidebysig specialname static\n void I1.add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n .override method void I1::add_M01(class [mscorlib]System.Action)\n IL_0000: ret\n }\n\n .method private hidebysig specialname static\n void I1.remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n .override method void I1::remove_M01(class [mscorlib]System.Action)\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action I1.M01\n {\n .addon void C1::I1.add_M01(class [mscorlib]System.Action)\n .removeon void C1::I1.remove_M01(class [mscorlib]System.Action)\n }\n\n .method public hidebysig specialname static \n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .method public hidebysig specialname static \n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void C1::add_M01(class [mscorlib]System.Action)\n .removeon void C1::remove_M01(class [mscorlib]System.Action)\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: ret\n }\n}\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements I1\n{\n .method public hidebysig specialname static \n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .method public hidebysig specialname static \n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void C2::add_M01(class [mscorlib]System.Action)\n .removeon void C2::remove_M01(class [mscorlib]System.Action)\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n }\n}\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1\n{\n}\n\npublic class C5 : C2, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n var c1M01 = (EventSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"event System.Action C1.I1.M01\", c1M01.ToTestDisplayString());\n\n Assert.Same(c1M01.AddMethod, c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01.RemoveMethod, c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, c1M01.AddMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, c1M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c2.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01.RemoveMethod, c2.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c3.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01.RemoveMethod, c3.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c4.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01.RemoveMethod, c4.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n var c2M01 = (EventSymbol)c5.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"event System.Action C2.M01\", c2M01.ToTestDisplayString());\n Assert.Same(c2M01.AddMethod, c5.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c2M01.RemoveMethod, c5.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_11()\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n scenario1();\n scenario2();\n scenario3();\n\n void scenario1()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname static virtual\n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .method public hidebysig specialname static virtual\n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action)\n .removeon void I1::remove_M01(class [mscorlib]System.Action)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { add{} remove{} }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,34): error CS0539: 'C1.M01' in explicit interface declaration is not found among members of the interface that can be implemented\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 34)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} remove{} }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n Assert.Equal(1, c.GetMembers().OfType<EventSymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n Assert.Null(c.FindImplementationForInterfaceMember(m01));\n Assert.Null(c.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c.FindImplementationForInterfaceMember(m01.RemoveMethod));\n }\n }\n\n void scenario2()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .method public hidebysig specialname static virtual\n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action)\n .removeon void I1::remove_M01(class [mscorlib]System.Action)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { add {} }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (4,34): error CS0065: 'C1.I1.M01': event property must have both add and remove accessors\n // static event System.Action I1.M01 { add {} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.I1.M01\").WithLocation(4, 34)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n var c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, c1M01.AddMethod.ExplicitInterfaceImplementations.Single());\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} remove{} }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n var m01Add = m01.AddMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<EventSymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (EventSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"event System.Action C1.M01\", cM01.ToTestDisplayString());\n\n var cM01Add = cM01.AddMethod;\n Assert.Same(cM01Add, c.FindImplementationForInterfaceMember(m01Add));\n\n Assert.True(cM01Add.IsStatic);\n Assert.False(cM01Add.IsAbstract);\n Assert.False(cM01Add.IsVirtual);\n Assert.False(cM01Add.IsMetadataVirtual());\n Assert.False(cM01Add.IsMetadataFinal);\n Assert.False(cM01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, cM01Add.MethodKind);\n\n Assert.Equal(\"void C1.M01.add\", cM01Add.ToTestDisplayString());\n\n var cM01Remove = cM01.RemoveMethod;\n\n Assert.True(cM01Remove.IsStatic);\n Assert.False(cM01Remove.IsAbstract);\n Assert.False(cM01Remove.IsVirtual);\n Assert.False(cM01Remove.IsMetadataVirtual());\n Assert.False(cM01Remove.IsMetadataFinal);\n Assert.False(cM01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, cM01Remove.MethodKind);\n\n Assert.Equal(\"void C1.M01.remove\", cM01Remove.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01Add, cM01Add.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01Add.ExplicitInterfaceImplementations);\n }\n\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Remove.ExplicitInterfaceImplementations);\n }\n\n var source4 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { add{} remove{} }\n}\n\";\n\n var compilation4 = CreateCompilationWithIL(source4, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation4.VerifyDiagnostics(\n // (4,46): error CS0550: 'C1.I1.M01.remove' adds an accessor not found in interface member 'I1.M01'\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"remove\").WithArguments(\"C1.I1.M01.remove\", \"I1.M01\").WithLocation(4, 46)\n );\n\n c1 = compilation4.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, c1M01.AddMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, c1M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n\n var source5 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} }\n}\n\";\n\n var compilation5 = CreateCompilationWithIL(source5, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation5.VerifyDiagnostics(\n // (4,38): error CS0065: 'C1.M01': event property must have both add and remove accessors\n // public static event System.Action M01 { add{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 38)\n );\n\n c1 = compilation5.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var source6 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { remove{} }\n}\n\";\n\n var compilation6 = CreateCompilationWithIL(source6, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation6.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.add'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.add\").WithLocation(2, 19),\n // (4,38): error CS0065: 'C1.M01': event property must have both add and remove accessors\n // public static event System.Action M01 { remove{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 38)\n );\n\n c1 = compilation6.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var source7 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { remove{} }\n}\n\";\n\n var compilation7 = CreateCompilationWithIL(source7, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation7.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.add'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.add\").WithLocation(2, 19),\n // (4,34): error CS0065: 'C1.I1.M01': event property must have both add and remove accessors\n // static event System.Action I1.M01 { remove{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.I1.M01\").WithLocation(4, 34),\n // (4,40): error CS0550: 'C1.I1.M01.remove' adds an accessor not found in interface member 'I1.M01'\n // static event System.Action I1.M01 { remove{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"remove\").WithArguments(\"C1.I1.M01.remove\", \"I1.M01\").WithLocation(4, 40)\n );\n\n c1 = compilation7.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, c1M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n }\n\n void scenario3()\n {\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname static virtual\n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n IL_0000: ret\n }\n\n .method public hidebysig specialname abstract virtual static \n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action)\n .removeon void I1::remove_M01(class [mscorlib]System.Action)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01.AddMethod));\n\n var source2 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { remove {} }\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (4,34): error CS0065: 'C1.I1.M01': event property must have both add and remove accessors\n // static event System.Action I1.M01 { add {} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.I1.M01\").WithLocation(4, 34)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n var c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.RemoveMethod, c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, c1M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n\n var source3 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} remove{} }\n}\n\";\n\n var compilation3 = CreateCompilationWithIL(source3, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation3, sourceSymbolValidator: validate3, symbolValidator: validate3, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate3(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C1\");\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n var m01Remove = m01.RemoveMethod;\n\n Assert.Equal(1, c.GetMembers().OfType<EventSymbol>().Count());\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var cM01 = (EventSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n\n Assert.Equal(\"event System.Action C1.M01\", cM01.ToTestDisplayString());\n\n var cM01Remove = cM01.RemoveMethod;\n Assert.Same(cM01Remove, c.FindImplementationForInterfaceMember(m01Remove));\n\n Assert.True(cM01Remove.IsStatic);\n Assert.False(cM01Remove.IsAbstract);\n Assert.False(cM01Remove.IsVirtual);\n Assert.False(cM01Remove.IsMetadataVirtual());\n Assert.False(cM01Remove.IsMetadataFinal);\n Assert.False(cM01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, cM01Remove.MethodKind);\n\n Assert.Equal(\"void C1.M01.remove\", cM01Remove.ToTestDisplayString());\n\n var cM01Add = cM01.AddMethod;\n\n Assert.True(cM01Add.IsStatic);\n Assert.False(cM01Add.IsAbstract);\n Assert.False(cM01Add.IsVirtual);\n Assert.False(cM01Add.IsMetadataVirtual());\n Assert.False(cM01Add.IsMetadataFinal);\n Assert.False(cM01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, cM01Add.MethodKind);\n\n Assert.Equal(\"void C1.M01.add\", cM01Add.ToTestDisplayString());\n\n Assert.Null(c.FindImplementationForInterfaceMember(m01.AddMethod));\n\n if (module is PEModuleSymbol)\n {\n Assert.Same(m01Remove, cM01Remove.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01Remove.ExplicitInterfaceImplementations);\n }\n\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n Assert.Empty(cM01Add.ExplicitInterfaceImplementations);\n }\n\n var source4 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { add{} remove{} }\n}\n\";\n\n var compilation4 = CreateCompilationWithIL(source4, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation4.VerifyDiagnostics(\n // (4,40): error CS0550: 'C1.I1.M01.add' adds an accessor not found in interface member 'I1.M01'\n // static event System.Action I1.M01 { add{} remove{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"add\").WithArguments(\"C1.I1.M01.add\", \"I1.M01\").WithLocation(4, 40)\n );\n\n c1 = compilation4.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.RemoveMethod, c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, c1M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, c1M01.AddMethod.ExplicitInterfaceImplementations.Single());\n\n var source5 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { remove{} }\n}\n\";\n\n var compilation5 = CreateCompilationWithIL(source5, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation5.VerifyDiagnostics(\n // (4,38): error CS0065: 'C1.M01': event property must have both add and remove accessors\n // public static event System.Action M01 { remove{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 38)\n );\n\n c1 = compilation5.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.RemoveMethod, c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n\n var source6 =\n@\"\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} }\n}\n\";\n\n var compilation6 = CreateCompilationWithIL(source6, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation6.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.remove'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.remove\").WithLocation(2, 19),\n // (4,38): error CS0065: 'C1.M01': event property must have both add and remove accessors\n // public static event System.Action M01 { remove{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.M01\").WithLocation(4, 38)\n );\n\n c1 = compilation6.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var source7 =\n@\"\npublic class C1 : I1\n{\n static event System.Action I1.M01 { add{} }\n}\n\";\n\n var compilation7 = CreateCompilationWithIL(source7, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation7.VerifyDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01.remove'\n // public class C1 : I1\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1\").WithArguments(\"C1\", \"I1.M01.remove\").WithLocation(2, 19),\n // (4,34): error CS0065: 'C1.I1.M01': event property must have both add and remove accessors\n // static event System.Action I1.M01 { add{} }\n Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, \"M01\").WithArguments(\"C1.I1.M01\").WithLocation(4, 34),\n // (4,40): error CS0550: 'C1.I1.M01.add' adds an accessor not found in interface member 'I1.M01'\n // static event System.Action I1.M01 { add{} }\n Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, \"add\").WithArguments(\"C1.I1.M01.add\", \"I1.M01\").WithLocation(4, 40)\n );\n\n c1 = compilation7.GlobalNamespace.GetTypeMember(\"C1\");\n i1 = c1.Interfaces().Single();\n m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, c1M01.AddMethod.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_12()\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n void add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .event [mscorlib]System.Action M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action)\n .removeon void I1::remove_M01(class [mscorlib]System.Action)\n }\n}\n\n.class interface public auto ansi abstract I2\n implements I1\n{\n .method private hidebysig specialname static\n void I1.add_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n .override method void I1::add_M01(class [mscorlib]System.Action)\n IL_0000: ret\n }\n\n .method private hidebysig specialname static\n void I1.remove_M01 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n .override method void I1::remove_M01(class [mscorlib]System.Action)\n IL_0000: ret\n }\n\n .event [mscorlib]System.Action I1.M01\n {\n .addon void I2::I1.add_M01(class [mscorlib]System.Action)\n .removeon void I2::I1.remove_M01(class [mscorlib]System.Action)\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I2\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1.M01'\n // public class C1 : I2\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2\").WithArguments(\"C1\", \"I1.M01\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<EventSymbol>().Single();\n\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Null(c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n var i2M01 = i2.GetMembers().OfType<EventSymbol>().Single();\n Assert.Same(m01, i2M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.AddMethod, i2M01.AddMethod.ExplicitInterfaceImplementations.Single());\n Assert.Same(m01.RemoveMethod, i2M01.RemoveMethod.ExplicitInterfaceImplementations.Single());\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_13()\n {\n // A forwarding method is added for an implicit implementation declared in base class. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\nclass C1\n{\n public static event System.Action M01 { add => throw null; remove{} }\n}\n\nclass C2 : C1, I1\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var m01 = module.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<EventSymbol>().Single();\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (EventSymbol)c2.FindImplementationForInterfaceMember(m01);\n var c2M01Add = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01.AddMethod);\n var c2M01Remove = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01.RemoveMethod);\n\n Assert.True(c2M01Add.IsStatic);\n Assert.False(c2M01Add.IsAbstract);\n Assert.False(c2M01Add.IsVirtual);\n Assert.False(c2M01Add.IsMetadataVirtual());\n Assert.False(c2M01Add.IsMetadataFinal);\n Assert.False(c2M01Add.IsMetadataNewSlot());\n\n Assert.True(c2M01Remove.IsStatic);\n Assert.False(c2M01Remove.IsAbstract);\n Assert.False(c2M01Remove.IsVirtual);\n Assert.False(c2M01Remove.IsMetadataVirtual());\n Assert.False(c2M01Remove.IsMetadataFinal);\n Assert.False(c2M01Remove.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01Add.MethodKind);\n Assert.False(c2M01Add.HasRuntimeSpecialName);\n Assert.False(c2M01Add.HasSpecialName);\n Assert.Equal(\"void C2.I1.add_M01(System.Action value)\", c2M01Add.ToTestDisplayString());\n Assert.Same(m01.AddMethod, c2M01Add.ExplicitInterfaceImplementations.Single());\n\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01Remove.MethodKind);\n Assert.False(c2M01Remove.HasRuntimeSpecialName);\n Assert.False(c2M01Remove.HasSpecialName);\n Assert.Equal(\"void C2.I1.remove_M01(System.Action value)\", c2M01Remove.ToTestDisplayString());\n Assert.Same(m01.RemoveMethod, c2M01Remove.ExplicitInterfaceImplementations.Single());\n\n // Forwarding methods for accessors aren't tied to a property\n Assert.Null(c2M01);\n\n var c1M01 = module.GlobalNamespace.GetMember<EventSymbol>(\"C1.M01\");\n var c1M01Add = c1M01.AddMethod;\n var c1M01Remove = c1M01.RemoveMethod;\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n Assert.True(c1M01Add.IsStatic);\n Assert.False(c1M01Add.IsAbstract);\n Assert.False(c1M01Add.IsVirtual);\n Assert.False(c1M01Add.IsMetadataVirtual());\n Assert.False(c1M01Add.IsMetadataFinal);\n Assert.False(c1M01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, c1M01Add.MethodKind);\n Assert.False(c1M01Add.HasRuntimeSpecialName);\n Assert.True(c1M01Add.HasSpecialName);\n Assert.Empty(c1M01Add.ExplicitInterfaceImplementations);\n\n Assert.True(c1M01Remove.IsStatic);\n Assert.False(c1M01Remove.IsAbstract);\n Assert.False(c1M01Remove.IsVirtual);\n Assert.False(c1M01Remove.IsMetadataVirtual());\n Assert.False(c1M01Remove.IsMetadataFinal);\n Assert.False(c1M01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, c1M01Remove.MethodKind);\n Assert.False(c1M01Remove.HasRuntimeSpecialName);\n Assert.True(c1M01Remove.HasSpecialName);\n Assert.Empty(c1M01Remove.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n\n Assert.Equal(\"event System.Action C1.M01\", c2M01.ToTestDisplayString());\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n Assert.Equal(MethodKind.EventAdd, c2M01Add.MethodKind);\n Assert.False(c2M01Add.HasRuntimeSpecialName);\n Assert.True(c2M01Add.HasSpecialName);\n Assert.Same(c2M01.AddMethod, c2M01Add);\n Assert.Empty(c2M01Add.ExplicitInterfaceImplementations);\n\n Assert.Equal(MethodKind.EventRemove, c2M01Remove.MethodKind);\n Assert.False(c2M01Remove.HasRuntimeSpecialName);\n Assert.True(c2M01Remove.HasSpecialName);\n Assert.Same(c2M01.RemoveMethod, c2M01Remove);\n Assert.Empty(c2M01Remove.ExplicitInterfaceImplementations);\n }\n }\n\n verifier.VerifyIL(\"C2.I1.add_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.add\"\"\n IL_0006: ret\n}\n\");\n\n verifier.VerifyIL(\"C2.I1.remove_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.remove\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_14()\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var ilSource = @\"\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig specialname abstract virtual static \n void add_M01 (\n class [mscorlib]System.Action`1<int32 modopt(I1)> 'value'\n ) cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void remove_M01 (\n class [mscorlib]System.Action`1<int32 modopt(I1)> 'value'\n ) cil managed \n {\n }\n\n .event class [mscorlib]System.Action`1<int32 modopt(I1)> M01\n {\n .addon void I1::add_M01(class [mscorlib]System.Action`1<int32 modopt(I1)>)\n .removeon void I1::remove_M01(class [mscorlib]System.Action`1<int32 modopt(I1)>)\n }\n}\n\n.class interface public auto ansi abstract I2\n{\n .method public hidebysig specialname abstract virtual static \n void add_M02 (\n class [mscorlib]System.Action modopt(I1) 'value'\n ) cil managed \n {\n }\n\n .method public hidebysig specialname abstract virtual static \n void modopt(I2) remove_M02 (\n class [mscorlib]System.Action 'value'\n ) cil managed \n {\n }\n\n .event class [mscorlib]System.Action M02\n {\n .addon void I2::add_M02(class [mscorlib]System.Action modopt(I1))\n .removeon void modopt(I2) I2::remove_M02(class [mscorlib]System.Action)\n }\n}\n\";\n\n var source1 =\n@\"\nclass C1 : I1\n{\n public static event System.Action<int> M01 { add => throw null; remove{} }\n}\n\nclass C2 : I1\n{\n static event System.Action<int> I1.M01 { add => throw null; remove{} }\n}\n\n#pragma warning disable CS0067 // The event 'C3.M02' is never used\n\nclass C3 : I2\n{\n public static event System.Action M02;\n}\n\nclass C4 : I2\n{\n static event System.Action I2.M02 { add => throw null; remove{} }\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n var c1M01 = c1.GetMembers().OfType<EventSymbol>().Single();\n var c1M01Add = c1M01.AddMethod;\n var c1M01Remove = c1M01.RemoveMethod;\n\n Assert.Equal(\"event System.Action<System.Int32> C1.M01\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n\n Assert.Equal(MethodKind.EventAdd, c1M01Add.MethodKind);\n Assert.Equal(\"void C1.M01.add\", c1M01Add.ToTestDisplayString());\n Assert.Equal(\"System.Action<System.Int32> value\", c1M01Add.Parameters.Single().ToTestDisplayString());\n Assert.Empty(c1M01Add.ExplicitInterfaceImplementations);\n Assert.True(c1M01Add.IsStatic);\n Assert.False(c1M01Add.IsAbstract);\n Assert.False(c1M01Add.IsVirtual);\n Assert.False(c1M01Add.IsMetadataVirtual());\n Assert.False(c1M01Add.IsMetadataFinal);\n Assert.False(c1M01Add.IsMetadataNewSlot());\n\n Assert.Equal(MethodKind.EventRemove, c1M01Remove.MethodKind);\n Assert.Equal(\"void C1.M01.remove\", c1M01Remove.ToTestDisplayString());\n Assert.Equal(\"System.Action<System.Int32> value\", c1M01Remove.Parameters.Single().ToTestDisplayString());\n Assert.Empty(c1M01Remove.ExplicitInterfaceImplementations);\n Assert.True(c1M01Remove.IsStatic);\n Assert.False(c1M01Remove.IsAbstract);\n Assert.False(c1M01Remove.IsVirtual);\n Assert.False(c1M01Remove.IsMetadataVirtual());\n Assert.False(c1M01Remove.IsMetadataFinal);\n Assert.False(c1M01Remove.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n c1M01Add = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01.AddMethod);\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01Add.MethodKind);\n Assert.Equal(\"void C1.I1.add_M01(System.Action<System.Int32 modopt(I1)> value)\", c1M01Add.ToTestDisplayString());\n Assert.Same(m01.AddMethod, c1M01Add.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c1M01Add.IsStatic);\n Assert.False(c1M01Add.IsAbstract);\n Assert.False(c1M01Add.IsVirtual);\n Assert.False(c1M01Add.IsMetadataVirtual());\n Assert.False(c1M01Add.IsMetadataFinal);\n Assert.False(c1M01Add.IsMetadataNewSlot());\n\n c1M01Remove = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01.RemoveMethod);\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01Remove.MethodKind);\n Assert.Equal(\"void C1.I1.remove_M01(System.Action<System.Int32 modopt(I1)> value)\", c1M01Remove.ToTestDisplayString());\n Assert.Same(m01.RemoveMethod, c1M01Remove.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c1M01Remove.IsStatic);\n Assert.False(c1M01Remove.IsAbstract);\n Assert.False(c1M01Remove.IsVirtual);\n Assert.False(c1M01Remove.IsMetadataVirtual());\n Assert.False(c1M01Remove.IsMetadataFinal);\n Assert.False(c1M01Remove.IsMetadataNewSlot());\n\n // Forwarding methods aren't tied to an event \n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n }\n else\n {\n Assert.Same(c1M01, c1.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01Add, c1.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01Remove, c1.FindImplementationForInterfaceMember(m01.RemoveMethod));\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n\n var c2M01 = (EventSymbol)c2.FindImplementationForInterfaceMember(m01);\n var c2M01Add = c2M01.AddMethod;\n var c2M01Remove = c2M01.RemoveMethod;\n\n Assert.Equal(\"event System.Action<System.Int32 modopt(I1)> C2.I1.M01\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.Same(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c2M01Add.IsStatic);\n Assert.False(c2M01Add.IsAbstract);\n Assert.False(c2M01Add.IsVirtual);\n Assert.False(c2M01Add.IsMetadataVirtual());\n Assert.False(c2M01Add.IsMetadataFinal);\n Assert.False(c2M01Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, c2M01Add.MethodKind);\n Assert.Equal(\"void C2.I1.M01.add\", c2M01Add.ToTestDisplayString());\n Assert.Equal(\"System.Action<System.Int32 modopt(I1)> value\", c2M01Add.Parameters.Single().ToTestDisplayString());\n Assert.Same(m01.AddMethod, c2M01Add.ExplicitInterfaceImplementations.Single());\n Assert.Same(c2M01Add, c2.FindImplementationForInterfaceMember(m01.AddMethod));\n\n Assert.True(c2M01Remove.IsStatic);\n Assert.False(c2M01Remove.IsAbstract);\n Assert.False(c2M01Remove.IsVirtual);\n Assert.False(c2M01Remove.IsMetadataVirtual());\n Assert.False(c2M01Remove.IsMetadataFinal);\n Assert.False(c2M01Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, c2M01Remove.MethodKind);\n Assert.Equal(\"void C2.I1.M01.remove\", c2M01Remove.ToTestDisplayString());\n Assert.Equal(\"System.Action<System.Int32 modopt(I1)> value\", c2M01Remove.Parameters.Single().ToTestDisplayString());\n Assert.Same(m01.RemoveMethod, c2M01Remove.ExplicitInterfaceImplementations.Single());\n Assert.Same(c2M01Remove, c2.FindImplementationForInterfaceMember(m01.RemoveMethod));\n\n Assert.Same(c2M01, c2.GetMembers().OfType<EventSymbol>().Single());\n Assert.Equal(2, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n var m02 = c3.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n var c3M02 = c3.GetMembers().OfType<EventSymbol>().Single();\n var c3M02Add = c3M02.AddMethod;\n var c3M02Remove = c3M02.RemoveMethod;\n\n Assert.Equal(\"event System.Action C3.M02\", c3M02.ToTestDisplayString());\n Assert.Empty(c3M02.ExplicitInterfaceImplementations);\n Assert.True(c3M02.IsStatic);\n Assert.False(c3M02.IsAbstract);\n Assert.False(c3M02.IsVirtual);\n\n Assert.Equal(MethodKind.EventAdd, c3M02Add.MethodKind);\n Assert.Equal(\"void C3.M02.add\", c3M02Add.ToTestDisplayString());\n Assert.Equal(\"System.Action value\", c3M02Add.Parameters.Single().ToTestDisplayString());\n Assert.Empty(c3M02Add.ExplicitInterfaceImplementations);\n Assert.True(c3M02Add.IsStatic);\n Assert.False(c3M02Add.IsAbstract);\n Assert.False(c3M02Add.IsVirtual);\n Assert.False(c3M02Add.IsMetadataVirtual());\n Assert.False(c3M02Add.IsMetadataFinal);\n Assert.False(c3M02Add.IsMetadataNewSlot());\n\n Assert.Equal(MethodKind.EventRemove, c3M02Remove.MethodKind);\n Assert.Equal(\"void C3.M02.remove\", c3M02Remove.ToTestDisplayString());\n Assert.Equal(\"System.Void\", c3M02Remove.ReturnTypeWithAnnotations.ToTestDisplayString());\n Assert.Empty(c3M02Remove.ExplicitInterfaceImplementations);\n Assert.True(c3M02Remove.IsStatic);\n Assert.False(c3M02Remove.IsAbstract);\n Assert.False(c3M02Remove.IsVirtual);\n Assert.False(c3M02Remove.IsMetadataVirtual());\n Assert.False(c3M02Remove.IsMetadataFinal);\n Assert.False(c3M02Remove.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n c3M02Add = (MethodSymbol)c3.FindImplementationForInterfaceMember(m02.AddMethod);\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c3M02Add.MethodKind);\n Assert.Equal(\"void C3.I2.add_M02(System.Action modopt(I1) value)\", c3M02Add.ToTestDisplayString());\n Assert.Same(m02.AddMethod, c3M02Add.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c3M02Add.IsStatic);\n Assert.False(c3M02Add.IsAbstract);\n Assert.False(c3M02Add.IsVirtual);\n Assert.False(c3M02Add.IsMetadataVirtual());\n Assert.False(c3M02Add.IsMetadataFinal);\n Assert.False(c3M02Add.IsMetadataNewSlot());\n\n c3M02Remove = (MethodSymbol)c3.FindImplementationForInterfaceMember(m02.RemoveMethod);\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c3M02Remove.MethodKind);\n Assert.Equal(\"void modopt(I2) C3.I2.remove_M02(System.Action value)\", c3M02Remove.ToTestDisplayString());\n Assert.Same(m02.RemoveMethod, c3M02Remove.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c3M02Remove.IsStatic);\n Assert.False(c3M02Remove.IsAbstract);\n Assert.False(c3M02Remove.IsVirtual);\n Assert.False(c3M02Remove.IsMetadataVirtual());\n Assert.False(c3M02Remove.IsMetadataFinal);\n Assert.False(c3M02Remove.IsMetadataNewSlot());\n\n // Forwarding methods aren't tied to an event \n Assert.Null(c3.FindImplementationForInterfaceMember(m02));\n }\n else\n {\n Assert.Same(c3M02, c3.FindImplementationForInterfaceMember(m02));\n Assert.Same(c3M02Add, c3.FindImplementationForInterfaceMember(m02.AddMethod));\n Assert.Same(c3M02Remove, c3.FindImplementationForInterfaceMember(m02.RemoveMethod));\n }\n\n var c4 = module.GlobalNamespace.GetTypeMember(\"C4\");\n\n var c4M02 = (EventSymbol)c4.FindImplementationForInterfaceMember(m02);\n var c4M02Add = c4M02.AddMethod;\n var c4M02Remove = c4M02.RemoveMethod;\n\n Assert.Equal(\"event System.Action C4.I2.M02\", c4M02.ToTestDisplayString());\n\n // Signatures of accessors are lacking custom modifiers due to https://github.com/dotnet/roslyn/issues/53390.\n\n Assert.True(c4M02.IsStatic);\n Assert.False(c4M02.IsAbstract);\n Assert.False(c4M02.IsVirtual);\n Assert.Same(m02, c4M02.ExplicitInterfaceImplementations.Single());\n\n Assert.True(c4M02Add.IsStatic);\n Assert.False(c4M02Add.IsAbstract);\n Assert.False(c4M02Add.IsVirtual);\n Assert.False(c4M02Add.IsMetadataVirtual());\n Assert.False(c4M02Add.IsMetadataFinal);\n Assert.False(c4M02Add.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventAdd, c4M02Add.MethodKind);\n Assert.Equal(\"void C4.I2.M02.add\", c4M02Add.ToTestDisplayString());\n Assert.Equal(\"System.Action value\", c4M02Add.Parameters.Single().ToTestDisplayString());\n Assert.Equal(\"System.Void\", c4M02Add.ReturnTypeWithAnnotations.ToTestDisplayString());\n Assert.Same(m02.AddMethod, c4M02Add.ExplicitInterfaceImplementations.Single());\n Assert.Same(c4M02Add, c4.FindImplementationForInterfaceMember(m02.AddMethod));\n\n Assert.True(c4M02Remove.IsStatic);\n Assert.False(c4M02Remove.IsAbstract);\n Assert.False(c4M02Remove.IsVirtual);\n Assert.False(c4M02Remove.IsMetadataVirtual());\n Assert.False(c4M02Remove.IsMetadataFinal);\n Assert.False(c4M02Remove.IsMetadataNewSlot());\n Assert.Equal(MethodKind.EventRemove, c4M02Remove.MethodKind);\n Assert.Equal(\"void C4.I2.M02.remove\", c4M02Remove.ToTestDisplayString());\n Assert.Equal(\"System.Action value\", c4M02Remove.Parameters.Single().ToTestDisplayString());\n Assert.Equal(\"System.Void\", c4M02Remove.ReturnTypeWithAnnotations.ToTestDisplayString());\n Assert.Same(m02.RemoveMethod, c4M02Remove.ExplicitInterfaceImplementations.Single());\n Assert.Same(c4M02Remove, c4.FindImplementationForInterfaceMember(m02.RemoveMethod));\n\n Assert.Same(c4M02, c4.GetMembers().OfType<EventSymbol>().Single());\n Assert.Equal(2, c4.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n }\n\n verifier.VerifyIL(\"C1.I1.add_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.add\"\"\n IL_0006: ret\n}\n\");\n\n verifier.VerifyIL(\"C1.I1.remove_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C1.M01.remove\"\"\n IL_0006: ret\n}\n\");\n\n verifier.VerifyIL(\"C3.I2.add_M02\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C3.M02.add\"\"\n IL_0006: ret\n}\n\");\n\n verifier.VerifyIL(\"C3.I2.remove_M02\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C3.M02.remove\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_15()\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n abstract static event System.Action M02;\n}\n\npublic class C1\n{\n public static event System.Action M01 { add => throw null; remove{} }\n}\n\npublic class C2 : C1, I1\n{\n static event System.Action I1.M02 { add => throw null; remove{} }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<EventSymbol>());\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(\"M01\").OfType<EventSymbol>().Single();\n\n var c1M01 = c3.BaseType().BaseType().GetMember<EventSymbol>(\"M01\");\n Assert.Equal(\"event System.Action C1.M01\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n var c1M01Add = c1M01.AddMethod;\n Assert.True(c1M01Add.IsStatic);\n Assert.False(c1M01Add.IsAbstract);\n Assert.False(c1M01Add.IsVirtual);\n Assert.False(c1M01Add.IsMetadataVirtual());\n Assert.False(c1M01Add.IsMetadataFinal);\n Assert.False(c1M01Add.IsMetadataNewSlot());\n\n Assert.Empty(c1M01Add.ExplicitInterfaceImplementations);\n\n var c1M01Remove = c1M01.RemoveMethod;\n Assert.True(c1M01Remove.IsStatic);\n Assert.False(c1M01Remove.IsAbstract);\n Assert.False(c1M01Remove.IsVirtual);\n Assert.False(c1M01Remove.IsMetadataVirtual());\n Assert.False(c1M01Remove.IsMetadataFinal);\n Assert.False(c1M01Remove.IsMetadataNewSlot());\n\n Assert.Empty(c1M01Remove.ExplicitInterfaceImplementations);\n\n if (c1M01.ContainingModule is PEModuleSymbol)\n {\n var c2M01Add = c3.FindImplementationForInterfaceMember(m01.AddMethod);\n Assert.Equal(\"void C2.I1.add_M01(System.Action value)\", c2M01Add.ToTestDisplayString());\n\n var c2M01Remove = c3.FindImplementationForInterfaceMember(m01.RemoveMethod);\n Assert.Equal(\"void C2.I1.remove_M01(System.Action value)\", c2M01Remove.ToTestDisplayString());\n\n // Forwarding methods for accessors aren't tied to an event\n Assert.Null(c3.FindImplementationForInterfaceMember(m01));\n }\n else\n {\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c1M01.AddMethod, c3.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c1M01.RemoveMethod, c3.FindImplementationForInterfaceMember(m01.RemoveMethod));\n }\n\n var m02 = c3.Interfaces().Single().GetMembers(\"M02\").OfType<EventSymbol>().Single();\n\n var c2M02 = c3.BaseType().GetMember<EventSymbol>(\"I1.M02\");\n Assert.Equal(\"event System.Action C2.I1.M02\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n Assert.Same(c2M02.AddMethod, c3.FindImplementationForInterfaceMember(m02.AddMethod));\n Assert.Same(c2M02.RemoveMethod, c3.FindImplementationForInterfaceMember(m02.RemoveMethod));\n }\n }\n\n [Fact]\n public void ImplementAbstractStaticEvent_16()\n {\n // A new implicit implementation is properly considered.\n\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action M01;\n}\n\npublic class C1 : I1\n{\n public static event System.Action M01 { add{} remove => throw null; }\n}\n\npublic class C2 : C1\n{\n new public static event System.Action M01 { add{} remove => throw null; }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n var verifier = CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"C3.I1.add_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C2.M01.add\"\"\n IL_0006: ret\n}\n\");\n\n verifier.VerifyIL(\"C3.I1.remove_M01\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"void C2.M01.remove\"\"\n IL_0006: ret\n}\n\");\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n var m01 = c3.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n var c2M01 = c3.BaseType().GetMember<EventSymbol>(\"M01\");\n var c2M01Add = c2M01.AddMethod;\n var c2M01Remove = c2M01.RemoveMethod;\n Assert.Equal(\"event System.Action C2.M01\", c2M01.ToTestDisplayString());\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n\n Assert.True(c2M01Add.IsStatic);\n Assert.False(c2M01Add.IsAbstract);\n Assert.False(c2M01Add.IsVirtual);\n Assert.False(c2M01Add.IsMetadataVirtual());\n Assert.False(c2M01Add.IsMetadataFinal);\n Assert.False(c2M01Add.IsMetadataNewSlot());\n Assert.Empty(c2M01Add.ExplicitInterfaceImplementations);\n\n Assert.True(c2M01Remove.IsStatic);\n Assert.False(c2M01Remove.IsAbstract);\n Assert.False(c2M01Remove.IsVirtual);\n Assert.False(c2M01Remove.IsMetadataVirtual());\n Assert.False(c2M01Remove.IsMetadataFinal);\n Assert.False(c2M01Remove.IsMetadataNewSlot());\n Assert.Empty(c2M01Remove.ExplicitInterfaceImplementations);\n\n if (module is PEModuleSymbol)\n {\n var c3M01 = (EventSymbol)c3.FindImplementationForInterfaceMember(m01);\n // Forwarding methods for accessors aren't tied to an event\n Assert.Null(c3M01);\n\n var c3M01Add = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01.AddMethod);\n Assert.Equal(\"void C3.I1.add_M01(System.Action value)\", c3M01Add.ToTestDisplayString());\n Assert.Same(m01.AddMethod, c3M01Add.ExplicitInterfaceImplementations.Single());\n\n var c3M01Remove = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01.RemoveMethod);\n Assert.Equal(\"void C3.I1.remove_M01(System.Action value)\", c3M01Remove.ToTestDisplayString());\n Assert.Same(m01.RemoveMethod, c3M01Remove.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Same(c2M01, c3.FindImplementationForInterfaceMember(m01));\n Assert.Same(c2M01Add, c3.FindImplementationForInterfaceMember(m01.AddMethod));\n Assert.Same(c2M01Remove, c3.FindImplementationForInterfaceMember(m01.RemoveMethod));\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_19(bool genericFirst)\n {\n // An \"ambiguity\" in implicit/explicit implementation declared in generic base class.\n\n var generic =\n@\"\n public static event System.Action<T> M01 { add{} remove{} }\n\";\n var nonGeneric =\n@\"\n static event System.Action<int> I1.M01 { add{} remove{} }\n\";\n var source1 =\n@\"\npublic interface I1\n{\n abstract static event System.Action<int> M01;\n}\n\npublic class C1<T> : I1\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().OfType<EventSymbol>().Where(m => m.Name.Contains(\"M01\")).Count());\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (EventSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"event System.Action<System.Int32> C1<T>.I1.M01\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Same(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticEvent_20(bool genericFirst)\n {\n // Same as ImplementAbstractStaticEvent_19 only interface is generic too.\n\n var generic =\n@\"\n static event System.Action<T> I1<T>.M01 { add{} remove{} }\n\";\n var nonGeneric =\n@\"\n public static event System.Action<int> M01 { add{} remove{} }\n\";\n var source1 =\n@\"\npublic interface I1<T>\n{\n abstract static event System.Action<T> M01;\n}\n\npublic class C1<T> : I1<T>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().OfType<EventSymbol>().Where(m => m.Name.Contains(\"M01\")).Count());\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C2 : C1<int>, I1<int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers().OfType<EventSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (EventSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"event System.Action<T> C1<T>.I1<T>.M01\", c1M01.OriginalDefinition.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n private static string ConversionOperatorName(string op) => op switch { \"implicit\" => WellKnownMemberNames.ImplicitConversionName, \"explicit\" => WellKnownMemberNames.ExplicitConversionName, _ => throw TestExceptionUtilities.UnexpectedValue(op) };\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_01([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n string opName = ConversionOperatorName(op);\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\n\" + typeKeyword + @\"\n C1 : I1<C1>\n{}\n\n\" + typeKeyword + @\"\n C2 : I1<C2>\n{\n public \" + op + @\" operator int(C2 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C3 : I1<C3>\n{\n static \" + op + @\" operator int(C3 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C4 : I1<C4>\n{\n \" + op + @\" I1<C4>.operator int(C4 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C5 : I1<C5>\n{\n public static \" + op + @\" operator long(C5 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C6 : I1<C6>\n{\n static \" + op + @\" I1<C6>.operator long(C6 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C7 : I1<C7>\n{\n public static int \" + opName + @\"(C7 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C8 : I1<C8>\n{\n static int I1<C8>.\" + opName + @\"(C8 x) => throw null;\n}\n\npublic interface I2<T> where T : I2<T>\n{\n abstract static int \" + opName + @\"(T x);\n}\n\n\" + typeKeyword + @\"\n C9 : I2<C9>\n{\n public static \" + op + @\" operator int(C9 x) => throw null;\n}\n\n\" + typeKeyword + @\"\n C10 : I2<C10>\n{\n static \" + op + @\" I2<C10>.operator int(C10 x) => throw null;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (8,10): error CS0535: 'C1' does not implement interface member 'I1<C1>.explicit operator int(C1)'\n // C1 : I1<C1>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C1>\").WithArguments(\"C1\", \"I1<C1>.\" + op + \" operator int(C1)\").WithLocation(8, 10),\n // (12,10): error CS8928: 'C2' does not implement static interface member 'I1<C2>.explicit operator int(C2)'. 'C2.explicit operator int(C2)' cannot implement the interface member because it is not static.\n // C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotStatic, \"I1<C2>\").WithArguments(\"C2\", \"I1<C2>.\" + op + \" operator int(C2)\", \"C2.\" + op + \" operator int(C2)\").WithLocation(12, 10),\n // (14,30): error CS0558: User-defined operator 'C2.explicit operator int(C2)' must be declared static and public\n // public explicit operator int(C2 x) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, \"int\").WithArguments(\"C2.\" + op + \" operator int(C2)\").WithLocation(14, 30),\n // (18,10): error CS0737: 'C3' does not implement interface member 'I1<C3>.explicit operator int(C3)'. 'C3.explicit operator int(C3)' cannot implement an interface member because it is not public.\n // C3 : I1<C3>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberNotPublic, \"I1<C3>\").WithArguments(\"C3\", \"I1<C3>.\" + op + \" operator int(C3)\", \"C3.\" + op + \" operator int(C3)\").WithLocation(18, 10),\n // (20,30): error CS0558: User-defined operator 'C3.explicit operator int(C3)' must be declared static and public\n // static explicit operator int(C3 x) => throw null;\n Diagnostic(ErrorCode.ERR_OperatorsMustBeStatic, \"int\").WithArguments(\"C3.\" + op + \" operator int(C3)\").WithLocation(20, 30),\n // (24,10): error CS0535: 'C4' does not implement interface member 'I1<C4>.explicit operator int(C4)'\n // C4 : I1<C4>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C4>\").WithArguments(\"C4\", \"I1<C4>.\" + op + \" operator int(C4)\").WithLocation(24, 10),\n // (26,30): error CS8930: Explicit implementation of a user-defined operator 'C4.explicit operator int(C4)' must be declared static\n // explicit I1<C4>.operator int(C4 x) => throw null;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, \"int\").WithArguments(\"C4.\" + op + \" operator int(C4)\").WithLocation(26, 30),\n // (26,30): error CS0539: 'C4.explicit operator int(C4)' in explicit interface declaration is not found among members of the interface that can be implemented\n // explicit I1<C4>.operator int(C4 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"C4.\" + op + \" operator int(C4)\").WithLocation(26, 30),\n // (30,10): error CS0738: 'C5' does not implement interface member 'I1<C5>.explicit operator int(C5)'. 'C5.explicit operator long(C5)' cannot implement 'I1<C5>.explicit operator int(C5)' because it does not have the matching return type of 'int'.\n // C5 : I1<C5>\n Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongReturnType, \"I1<C5>\").WithArguments(\"C5\", \"I1<C5>.\" + op + \" operator int(C5)\", \"C5.\" + op + \" operator long(C5)\", \"int\").WithLocation(30, 10),\n // (36,10): error CS0535: 'C6' does not implement interface member 'I1<C6>.explicit operator int(C6)'\n // C6 : I1<C6>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C6>\").WithArguments(\"C6\", \"I1<C6>.\" + op + \" operator int(C6)\").WithLocation(36, 10),\n // (38,37): error CS0539: 'C6.explicit operator long(C6)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static explicit I1<C6>.operator long(C6 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"long\").WithArguments(\"C6.\" + op + \" operator long(C6)\").WithLocation(38, 37),\n // (42,10): error CS0535: 'C7' does not implement interface member 'I1<C7>.explicit operator int(C7)'\n // C7 : I1<C7>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C7>\").WithArguments(\"C7\", \"I1<C7>.\" + op + \" operator int(C7)\").WithLocation(42, 10),\n // (48,10): error CS0535: 'C8' does not implement interface member 'I1<C8>.explicit operator int(C8)'\n // C8 : I1<C8>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I1<C8>\").WithArguments(\"C8\", \"I1<C8>.\" + op + \" operator int(C8)\").WithLocation(48, 10),\n // (50,23): error CS0539: 'C8.op_Explicit(C8)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static int I1<C8>.op_Explicit(C8 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, opName).WithArguments(\"C8.\" + opName + \"(C8)\").WithLocation(50, 23),\n // (59,10): error CS0535: 'C9' does not implement interface member 'I2<C9>.op_Explicit(C9)'\n // C9 : I2<C9>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C9>\").WithArguments(\"C9\", \"I2<C9>.\" + opName + \"(C9)\").WithLocation(59, 10),\n // (65,11): error CS0535: 'C10' does not implement interface member 'I2<C10>.op_Explicit(C10)'\n // C10 : I2<C10>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C10>\").WithArguments(\"C10\", \"I2<C10>.\" + opName + \"(C10)\").WithLocation(65, 11),\n // (67,38): error CS0539: 'C10.explicit operator int(C10)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static explicit I2<C10>.operator int(C10 x) => throw null;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"C10.\" + op + \" operator int(C10)\").WithLocation(67, 38)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_03([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\ninterface I2<T> : I1<T> where T : I1<T>\n{}\n\ninterface I3<T> : I1<T> where T : I1<T>\n{\n \" + op + @\" operator int(T x) => default;\n}\n\ninterface I4<T> : I1<T> where T : I1<T>\n{\n static \" + op + @\" operator int(T x) => default;\n}\n\ninterface I5<T> : I1<T> where T : I1<T>\n{\n \" + op + @\" I1<T>.operator int(T x) => default;\n}\n\ninterface I6<T> : I1<T> where T : I1<T>\n{\n static \" + op + @\" I1<T>.operator int(T x) => default;\n}\n\ninterface I7<T> : I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\npublic interface I11<T> where T : I11<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\ninterface I8<T> : I11<T> where T : I8<T>\n{\n \" + op + @\" operator int(T x) => default;\n}\n\ninterface I9<T> : I11<T> where T : I9<T>\n{\n static \" + op + @\" operator int(T x) => default;\n}\n\ninterface I10<T> : I11<T> where T : I10<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\ninterface I12<T> : I11<T> where T : I12<T>\n{\n static \" + op + @\" I11<T>.operator int(T x) => default;\n}\n\ninterface I13<T> : I11<T> where T : I13<T>\n{\n abstract static \" + op + @\" I11<T>.operator int(T x);\n}\n\ninterface I14<T> : I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" I1<T>.operator int(T x);\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (12,23): error CS0556: User-defined conversion must convert to or from the enclosing type\n // implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_ConversionNotInvolvingContainedType, \"int\").WithLocation(12, 23),\n // (12,23): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(12, 23),\n // (17,30): error CS0556: User-defined conversion must convert to or from the enclosing type\n // static implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_ConversionNotInvolvingContainedType, \"int\").WithLocation(17, 30),\n // (17,30): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // static implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(17, 30),\n // (22,29): error CS8930: Explicit implementation of a user-defined operator 'I5<T>.implicit operator int(T)' must be declared static\n // implicit I1<T>.operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_ExplicitImplementationOfOperatorsMustBeStatic, \"int\").WithArguments(\"I5<T>.\" + op + \" operator int(T)\").WithLocation(22, 29),\n // (22,29): error CS0539: 'I5<T>.implicit operator int(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // implicit I1<T>.operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"I5<T>.\" + op + \" operator int(T)\").WithLocation(22, 29),\n // (27,36): error CS0539: 'I6<T>.implicit operator int(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static implicit I1<T>.operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"I6<T>.\" + op + \" operator int(T)\").WithLocation(27, 36),\n // (32,39): error CS8931: User-defined conversion in an interface must convert to or from a type parameter on the enclosing type constrained to the enclosing type\n // abstract static implicit operator int(T x);\n Diagnostic(ErrorCode.ERR_AbstractConversionNotInvolvingContainedType, \"int\").WithLocation(32, 39),\n // (42,23): error CS0556: User-defined conversion must convert to or from the enclosing type\n // implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_ConversionNotInvolvingContainedType, \"int\").WithLocation(42, 23),\n // (42,23): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(42, 23),\n // (47,30): error CS0556: User-defined conversion must convert to or from the enclosing type\n // static implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_ConversionNotInvolvingContainedType, \"int\").WithLocation(47, 30),\n // (47,30): error CS0567: Conversion, equality, or inequality operators declared in interfaces must be abstract\n // static implicit operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfacesCantContainConversionOrEqualityOperators, \"int\").WithLocation(47, 30),\n // (57,37): error CS0539: 'I12<T>.implicit operator int(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static implicit I11<T>.operator int(T x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"I12<T>.\" + op + \" operator int(T)\").WithLocation(57, 37),\n // (62,46): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static implicit I11<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"abstract\").WithLocation(62, 46),\n // (62,46): error CS0501: 'I13<T>.implicit operator int(T)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static implicit I11<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"int\").WithArguments(\"I13<T>.\" + op + \" operator int(T)\").WithLocation(62, 46),\n // (62,46): error CS0539: 'I13<T>.implicit operator int(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static implicit I11<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"I13<T>.\" + op + \" operator int(T)\").WithLocation(62, 46),\n // (67,45): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static implicit I1<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"abstract\").WithLocation(67, 45),\n // (67,45): error CS0501: 'I14<T>.implicit operator int(T)' must declare a body because it is not marked abstract, extern, or partial\n // abstract static implicit I1<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_ConcreteMissingBody, \"int\").WithArguments(\"I14<T>.\" + op + \" operator int(T)\").WithLocation(67, 45),\n // (67,45): error CS0539: 'I14<T>.implicit operator int(T)' in explicit interface declaration is not found among members of the interface that can be implemented\n // abstract static implicit I1<T>.operator int(T x);\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"I14<T>.\" + op + \" operator int(T)\").WithLocation(67, 45)\n );\n\n var m01 = compilation1.GlobalNamespace.GetTypeMember(\"I1\").GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I2\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I3\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I4\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I5\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I6\").FindImplementationForInterfaceMember(m01));\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I7\").FindImplementationForInterfaceMember(m01));\n\n var i8 = compilation1.GlobalNamespace.GetTypeMember(\"I8\");\n Assert.Null(i8.FindImplementationForInterfaceMember(i8.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i9 = compilation1.GlobalNamespace.GetTypeMember(\"I9\");\n Assert.Null(i9.FindImplementationForInterfaceMember(i9.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i10 = compilation1.GlobalNamespace.GetTypeMember(\"I10\");\n Assert.Null(i10.FindImplementationForInterfaceMember(i10.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i12 = compilation1.GlobalNamespace.GetTypeMember(\"I12\");\n Assert.Null(i12.FindImplementationForInterfaceMember(i12.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n var i13 = compilation1.GlobalNamespace.GetTypeMember(\"I13\");\n Assert.Null(i13.FindImplementationForInterfaceMember(i13.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single()));\n\n Assert.Null(compilation1.GlobalNamespace.GetTypeMember(\"I14\").FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_04([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I2<T> where T : I2<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1 : I2<Test1>\n{\n static \" + op + @\" I2<Test1>.operator int(Test1 x) => default;\n}\n\" + typeKeyword + @\"\n Test2: I2<Test2>\n{\n public static \" + op + @\" operator int(Test2 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,21): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static explicit I2<Test1>.operator int(Test1 x) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I2<Test1>.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 21)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (4,21): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // static explicit I2<Test1>.operator int(Test1 x) => default;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"I2<Test1>.\").WithArguments(\"static abstract members in interfaces\").WithLocation(4, 21),\n // (14,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static explicit operator int(T x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(14, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_05([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T> \n{\n abstract static \" + op + @\" operator int(T x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1: I1<Test1>\n{\n public static \" + op + @\" operator int(Test1 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.explicit operator int(Test1)' cannot implement interface member 'I1<Test1>.explicit operator int(Test1)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.\" + op + \" operator int(Test1)\", \"I1<Test1>.\" + op + \" operator int(Test1)\", \"Test1\").WithLocation(2, 12)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (2,12): error CS8929: 'Test1.explicit operator int(Test1)' cannot implement interface member 'I1<Test1>.explicit operator int(Test1)' in type 'Test1' because the target runtime doesn't support static abstract members in interfaces.\n // Test1: I1<Test1>\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfacesForMember, \"I1<Test1>\").WithArguments(\"Test1.\" + op + \" operator int(Test1)\", \"I1<Test1>.\" + op + \" operator int(Test1)\", \"Test1\").WithLocation(2, 12),\n // (9,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static explicit operator int(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(9, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_06([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\";\n var source2 =\ntypeKeyword + @\"\n Test1 : I1<Test1>\n{\n static \" + op + @\" I1<Test1>.operator int(Test1 x) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (4,40): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static explicit I1<Test1>.operator int(Test1 x) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(4, 40)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (4,40): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // static explicit I1<Test1>.operator int(Test1 x) => default;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(4, 40),\n // (9,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static explicit operator int(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(9, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_07([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n // Basic implicit implementation scenario, MethodImpl is emitted\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n abstract static \" + op + @\" operator long(T x);\n}\n\n\" + typeKeyword + @\"\n C : I1<C>\n{\n public static \" + op + @\" operator long(C x) => default;\n public static \" + op + @\" operator int(C x) => default;\n}\n\";\n\n var opName = ConversionOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n var i1 = c.Interfaces().Single();\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var m01 = i1.GetMembers().OfType<MethodSymbol>().First();\n\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Conversion, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.True(cM01.HasSpecialName);\n\n Assert.Equal(\"System.Int32 C.\" + opName + \"(C x)\", cM01.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM01.ExplicitInterfaceImplementations);\n }\n\n var m02 = i1.GetMembers().OfType<MethodSymbol>().ElementAt(1);\n\n var cM02 = (MethodSymbol)c.FindImplementationForInterfaceMember(m02);\n\n Assert.True(cM02.IsStatic);\n Assert.False(cM02.IsAbstract);\n Assert.False(cM02.IsVirtual);\n Assert.False(cM02.IsMetadataVirtual());\n Assert.False(cM02.IsMetadataFinal);\n Assert.False(cM02.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Conversion, cM02.MethodKind);\n Assert.False(cM02.HasRuntimeSpecialName);\n Assert.True(cM02.HasSpecialName);\n\n Assert.Equal(\"System.Int64 C.\" + opName + \"(C x)\", cM02.ToTestDisplayString());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(m02, cM02.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(cM02.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_08([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool structure)\n {\n // Basic explicit implementation scenario\n\n var typeKeyword = structure ? \"struct\" : \"class\";\n\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator C(T x);\n abstract static \" + op + @\" operator int(T x);\n}\n\n\" + typeKeyword + @\"\n C : I1<C>\n{\n static \" + op + @\" I1<C>.operator int(C x) => int.MaxValue;\n static \" + op + @\" I1<C>.operator C(C x) => default;\n}\n\";\n\n var opName = ConversionOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<LiteralExpressionSyntax>().Single();\n\n Assert.Equal(\"default\", node.ToString());\n Assert.Equal(\"C\", model.GetTypeInfo(node).ConvertedType.ToTestDisplayString());\n\n var declaredSymbol = model.GetDeclaredSymbol(node.FirstAncestorOrSelf<ConversionOperatorDeclarationSyntax>());\n Assert.Equal(\"C C.I1<C>.\" + opName + \"(C x)\", declaredSymbol.ToTestDisplayString());\n Assert.DoesNotContain(opName, declaredSymbol.ContainingType.MemberNames);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped,\n emitOptions: EmitOptions.Default.WithEmitMetadataOnly(true).WithIncludePrivateMembers(false)).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c = module.GlobalNamespace.GetTypeMember(\"C\");\n Assert.Equal(2, c.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Count());\n\n var m01 = c.Interfaces().Single().GetMembers().OfType<MethodSymbol>().First();\n var cM01 = (MethodSymbol)c.FindImplementationForInterfaceMember(m01);\n\n Assert.True(cM01.IsStatic);\n Assert.False(cM01.IsAbstract);\n Assert.False(cM01.IsVirtual);\n Assert.False(cM01.IsMetadataVirtual());\n Assert.False(cM01.IsMetadataFinal);\n Assert.False(cM01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM01.MethodKind);\n Assert.False(cM01.HasRuntimeSpecialName);\n Assert.False(cM01.HasSpecialName);\n\n Assert.Equal(\"C C.I1<C>.\" + opName + \"(C x)\", cM01.ToTestDisplayString());\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n\n var m02 = c.Interfaces().Single().GetMembers().OfType<MethodSymbol>().ElementAt(1);\n var cM02 = (MethodSymbol)c.FindImplementationForInterfaceMember(m02);\n\n Assert.True(cM02.IsStatic);\n Assert.False(cM02.IsAbstract);\n Assert.False(cM02.IsVirtual);\n Assert.False(cM02.IsMetadataVirtual());\n Assert.False(cM02.IsMetadataFinal);\n Assert.False(cM02.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, cM02.MethodKind);\n Assert.False(cM02.HasRuntimeSpecialName);\n Assert.False(cM02.HasSpecialName);\n\n Assert.Equal(\"System.Int32 C.I1<C>.\" + opName + \"(C x)\", cM02.ToTestDisplayString());\n Assert.Equal(m02, cM02.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_09([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Explicit implementation from base is treated as an implementation\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\npublic class C2 : I1<C2>\n{\n static \" + op + @\" I1<C2>.operator int(C2 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1<C2>\n{\n}\n\";\n\n var opName = ConversionOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n var m01 = c3.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var cM01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"System.Int32 C2.I1<C2>.\" + opName + \"(C2 x)\", cM01.ToTestDisplayString());\n Assert.Equal(m01, cM01.ExplicitInterfaceImplementations.Single());\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_10([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Implicit implementation is considered only for types implementing interface in source.\n // In metadata, only explicit implementations are considered\n\n var opName = ConversionOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n int32 \" + opName + @\" (\n !T x\n ) cil managed \n {\n }\n}\n\n.class public auto ansi beforefieldinit C1\n extends System.Object\n implements class I1`1<class C1>\n{\n .method private hidebysig static \n int32 'I1<C1>.\" + opName + @\"' (\n class C1 x\n ) cil managed \n {\n .override method int32 class I1`1<class C1>::\" + opName + @\"(!0)\n\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig static \n specialname int32 \" + opName + @\" (\n class C1 x\n ) cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n // Method begins at RVA 0x2053\n // Code size 8 (0x8)\n .maxstack 8\n\n IL_0000: ldarg.0\n IL_0001: call instance void System.Object::.ctor()\n IL_0006: nop\n IL_0007: ret\n }\n}\n\n.class public auto ansi beforefieldinit C2\n extends C1\n implements class I1`1<class C1>\n{\n .method public hidebysig static \n specialname int32 \" + opName + @\" (\n class C1 x\n ) cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n IL_0000: ldarg.0\n IL_0001: call instance void C1::.ctor()\n IL_0006: ret\n }\n}\n\";\n var source1 =\n@\"\npublic class C3 : C2\n{\n}\n\npublic class C4 : C1, I1<C1>\n{\n}\n\npublic class C5 : C2, I1<C1>\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.Conversion, m01.MethodKind);\n Assert.Equal(MethodKind.Conversion, c1.GetMember<MethodSymbol>(opName).MethodKind);\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.Equal(\"System.Int32 C1.I1<C1>.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n var c2 = compilation1.GlobalNamespace.GetTypeMember(\"C2\");\n Assert.Same(c1M01, c2.FindImplementationForInterfaceMember(m01));\n\n var c3 = compilation1.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Same(c1M01, c3.FindImplementationForInterfaceMember(m01));\n\n var c4 = compilation1.GlobalNamespace.GetTypeMember(\"C4\");\n Assert.Same(c1M01, c4.FindImplementationForInterfaceMember(m01));\n\n var c5 = compilation1.GlobalNamespace.GetTypeMember(\"C5\");\n\n var c2M01 = (MethodSymbol)c5.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"System.Int32 C2.\" + opName + \"(C1 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(MethodKind.Conversion, c2M01.MethodKind);\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_11([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Ignore invalid metadata (non-abstract static virtual method). \n\n var opName = ConversionOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname virtual static \n int32 \" + opName + @\" (\n !T x\n ) cil managed \n {\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I1<C1>\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i1 = c1.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.Conversion, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i1.FindImplementationForInterfaceMember(m01));\n\n compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics();\n\n var source2 =\n@\"\npublic class C1 : I1<C1>\n{\n static \" + op + @\" I1<C1>.operator int(C1 x) => default;\n}\n\";\n\n var compilation2 = CreateCompilationWithIL(source2, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyEmitDiagnostics(\n // (4,37): error CS0539: 'C1.implicit operator int(C1)' in explicit interface declaration is not found among members of the interface that can be implemented\n // static implicit I1<C1>.operator int(C1 x) => default;\n Diagnostic(ErrorCode.ERR_InterfaceMemberNotFound, \"int\").WithArguments(\"C1.\" + op + \" operator int(C1)\").WithLocation(4, 37)\n );\n\n c1 = compilation2.GlobalNamespace.GetTypeMember(\"C1\");\n m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(\"System.Int32 I1<C1>.\" + opName + \"(C1 x)\", m01.ToTestDisplayString());\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_12([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Ignore invalid metadata (default interface implementation for a static method)\n\n var opName = ConversionOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n int32 \" + opName + @\" (\n !T x\n ) cil managed \n {\n }\n}\n\n.class interface public auto ansi abstract I2`1<(class I1`1<!T>) T>\n implements class I1`1<!T>\n{\n .method private hidebysig static \n int32 'I1<!T>.\" + opName + @\"' (\n !T x\n ) cil managed \n {\n .override method int32 class I1`1<!T>::\" + opName + @\"(!0)\n\n IL_0000: ldc.i4.0\n IL_0001: ret\n }\n}\n\";\n\n var source1 =\n@\"\npublic class C1 : I2<C1>\n{\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyEmitDiagnostics(\n // (2,19): error CS0535: 'C1' does not implement interface member 'I1<C1>.explicit operator int(C1)'\n // public class C1 : I2<C1>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"I2<C1>\").WithArguments(\"C1\", \"I1<C1>.\" + op + \" operator int(C1)\").WithLocation(2, 19)\n );\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n var i2 = c1.Interfaces().Single();\n var i1 = i2.Interfaces().Single();\n var m01 = i1.GetMembers().OfType<MethodSymbol>().Single();\n\n Assert.Equal(MethodKind.Conversion, m01.MethodKind);\n Assert.Null(c1.FindImplementationForInterfaceMember(m01));\n Assert.Null(i2.FindImplementationForInterfaceMember(m01));\n\n var i2M01 = i2.GetMembers().OfType<MethodSymbol>().Single();\n Assert.Equal(m01, i2M01.ExplicitInterfaceImplementations.Single());\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_13([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // A forwarding method is added for an implicit implementation declared in base class. \n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator C1<T>(T x);\n}\n\npublic partial class C1<T>\n{\n public static \" + op + @\" operator C1<T>(T x) => default;\n}\n\npublic class C2 : C1<C2>, I1<C2>\n{\n}\n\";\n\n var opName = ConversionOperatorName(op);\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var i1 = c2.Interfaces().Single();\n var m01 = i1.GetMembers(opName).OfType<MethodSymbol>().Single();\n\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n Assert.False(c2M01.HasRuntimeSpecialName);\n Assert.False(c2M01.HasSpecialName);\n\n Assert.Equal(\"C1<C2> C2.I1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n var c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Conversion, c1M01.MethodKind);\n Assert.False(c1M01.HasRuntimeSpecialName);\n Assert.True(c1M01.HasSpecialName);\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.Conversion, c2M01.MethodKind);\n Assert.False(c2M01.HasRuntimeSpecialName);\n Assert.True(c2M01.HasSpecialName);\n\n Assert.Equal(\"C1<C2> C1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Empty(c2M01.ExplicitInterfaceImplementations);\n }\n }\n\n verifier.VerifyIL(\"C2.I1<C2>.\" + opName + \"(C2)\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"C1<C2> C1<C2>.\" + opName + @\"(C2)\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_14([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // A forwarding method is added for an implicit implementation with modopt mismatch. \n\n var opName = ConversionOperatorName(op);\n\n var ilSource = @\"\n.class interface public auto ansi abstract I1`1<(class I1`1<!T>) T>\n{\n // Methods\n .method public hidebysig specialname abstract virtual static \n int32 modopt(I1`1) \" + opName + @\" (\n !T x\n ) cil managed \n {\n }\n} \n\";\n\n var source1 =\n@\"\nclass C1 : I1<C1>\n{\n public static \" + op + @\" operator int(C1 x) => default;\n}\n\nclass C2 : I1<C2>\n{\n static \" + op + @\" I1<C2>.operator int(C2 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var c1 = module.GlobalNamespace.GetTypeMember(\"C1\");\n var m01 = c1.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n\n var c1M01 = (MethodSymbol)c1.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c1M01.MethodKind);\n Assert.Equal(\"System.Int32 modopt(I1<>) C1.I1<C1>.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n\n c1M01 = module.GlobalNamespace.GetMember<MethodSymbol>(\"C1.\" + opName);\n Assert.Equal(\"System.Int32 C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.Conversion, c1M01.MethodKind);\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n else\n {\n Assert.Equal(MethodKind.Conversion, c1M01.MethodKind);\n Assert.Equal(\"System.Int32 C1.\" + opName + \"(C1 x)\", c1M01.ToTestDisplayString());\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n m01 = c2.Interfaces().Single().GetMembers().OfType<MethodSymbol>().Single();\n var c2M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n\n Assert.True(c2M01.IsStatic);\n Assert.False(c2M01.IsAbstract);\n Assert.False(c2M01.IsVirtual);\n Assert.False(c2M01.IsMetadataVirtual());\n Assert.False(c2M01.IsMetadataFinal);\n Assert.False(c2M01.IsMetadataNewSlot());\n Assert.Equal(MethodKind.ExplicitInterfaceImplementation, c2M01.MethodKind);\n\n Assert.Equal(\"System.Int32 modopt(I1<>) C2.I1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n\n Assert.Same(c2M01, c2.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single());\n }\n\n verifier.VerifyIL(\"C1.I1<C1>.\" + opName + \"(C1)\",\n@\"\n{\n // Code size 7 (0x7)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: call \"\"int C1.\" + opName + @\"(C1)\"\"\n IL_0006: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_15([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // A forwarding method isn't created if base class implements interface exactly the same way. \n\n var source1 =\n@\"\npublic partial interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator C1<T>(T x);\n abstract static \" + op + @\" operator T(int x);\n}\n\npublic partial class C1<T>\n{\n public static \" + op + @\" operator C1<T>(T x) => default;\n}\n\npublic class C2 : C1<C2>, I1<C2>\n{\n static \" + op + @\" I1<C2>.operator C2(int x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics();\n\n var source2 =\n@\"\npublic class C3 : C2, I1<C2>\n{\n}\n\";\n\n var opName = ConversionOperatorName(op);\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.RegularPreview, TestOptions.Regular9 })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c3 = module.GlobalNamespace.GetTypeMember(\"C3\");\n Assert.Empty(c3.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()));\n\n var m01 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().First();\n\n var c1M01 = c3.BaseType().BaseType().GetMember<MethodSymbol>(opName);\n Assert.Equal(\"C1<C2> C1<C2>.\" + opName + \"(C2 x)\", c1M01.ToTestDisplayString());\n\n Assert.True(c1M01.IsStatic);\n Assert.False(c1M01.IsAbstract);\n Assert.False(c1M01.IsVirtual);\n Assert.False(c1M01.IsMetadataVirtual());\n Assert.False(c1M01.IsMetadataFinal);\n Assert.False(c1M01.IsMetadataNewSlot());\n\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n\n if (c1M01.ContainingModule is PEModuleSymbol)\n {\n var c2M01 = (MethodSymbol)c3.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"C1<C2> C2.I1<C2>.\" + opName + \"(C2 x)\", c2M01.ToTestDisplayString());\n Assert.Equal(m01, c2M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Equal(c1M01, c3.FindImplementationForInterfaceMember(m01));\n }\n\n var m02 = c3.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().ElementAt(1);\n\n var c2M02 = c3.BaseType().GetMembers(\"I1<C2>.\" + opName).OfType<MethodSymbol>().First();\n Assert.Equal(\"C2 C2.I1<C2>.\" + opName + \"(System.Int32 x)\", c2M02.ToTestDisplayString());\n Assert.Same(c2M02, c3.FindImplementationForInterfaceMember(m02));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_18([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool genericFirst)\n {\n // An \"ambiguity\" in implicit implementation declared in generic base class plus interface is generic too.\n\n var generic =\n@\"\n public static \" + op + @\" operator U(C1<T, U> x) => default;\n\";\n var nonGeneric =\n@\"\n public static \" + op + @\" operator int(C1<T, U> x) => default;\n\";\n var source1 =\n@\"\npublic interface I1<T, U> where T : I1<T, U>\n{\n abstract static \" + op + @\" operator U(T x);\n}\n\npublic class C1<T, U> : I1<C1<T, U>, U>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n\n\n var opName = ConversionOperatorName(op);\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n compilation1.VerifyDiagnostics();\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(opName)).Count());\n\n var source2 =\n@\"\npublic class C2 : C1<int, int>, I1<C1<int, int>, int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"U C1<T, U>.\" + opName + \"(C1<T, U> x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n var baseI1M01 = c2.BaseType().FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"U C1<T, U>.\" + opName + \"(C1<T, U> x)\", baseI1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(c1M01, baseI1M01);\n\n if (c1M01.OriginalDefinition.ContainingModule is PEModuleSymbol)\n {\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n }\n else\n {\n Assert.Empty(c1M01.ExplicitInterfaceImplementations);\n }\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ImplementAbstractStaticConversionOperator_20([CombinatorialValues(\"implicit\", \"explicit\")] string op, bool genericFirst)\n {\n // Same as ImplementAbstractStaticConversionOperator_18 only implementation is explicit in source.\n\n var generic =\n@\"\n static \" + op + @\" I1<C1<T, U>, U>.operator U(C1<T, U> x) => default;\n\";\n var nonGeneric =\n@\"\n public static \" + op + @\" operator int(C1<T, U> x) => default;\n\";\n var source1 =\n@\"\npublic interface I1<T, U> where T : I1<T, U>\n{\n abstract static \" + op + @\" operator U(T x);\n}\n\npublic class C1<T, U> : I1<C1<T, U>, U>\n{\n\" + (genericFirst ? generic + nonGeneric : nonGeneric + generic) + @\"\n}\n\";\n var opName = ConversionOperatorName(op);\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateCompilation(\"\", targetFramework: _supportingFramework).ToMetadataReference() });\n\n compilation1.VerifyDiagnostics();\n Assert.Equal(2, compilation1.GlobalNamespace.GetTypeMember(\"C1\").GetMembers().Where(m => m.Name.Contains(opName)).Count());\n\n var source2 =\n@\"\npublic class C2 : C1<int, int>, I1<C1<int, int>, int>\n{\n}\n\";\n\n foreach (var reference in new[] { compilation1.ToMetadataReference(), compilation1.EmitToImageReference() })\n {\n foreach (var parseOptions in new[] { TestOptions.Regular9, TestOptions.RegularPreview })\n {\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: parseOptions,\n targetFramework: _supportingFramework,\n references: new[] { reference });\n\n CompileAndVerify(compilation2, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n }\n }\n\n void validate(ModuleSymbol module)\n {\n var c2 = module.GlobalNamespace.GetTypeMember(\"C2\");\n var m01 = c2.Interfaces().Single().GetMembers(opName).OfType<MethodSymbol>().Single();\n\n Assert.True(m01.ContainingModule is RetargetingModuleSymbol or PEModuleSymbol);\n\n var c1M01 = (MethodSymbol)c2.FindImplementationForInterfaceMember(m01);\n Assert.Equal(\"U C1<T, U>.I1<C1<T, U>, U>.\" + opName + \"(C1<T, U> x)\", c1M01.OriginalDefinition.ToTestDisplayString());\n\n Assert.Equal(m01, c1M01.ExplicitInterfaceImplementations.Single());\n Assert.Same(c1M01, c2.BaseType().FindImplementationForInterfaceMember(m01));\n }\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitImplementationModifiersConversionOperator_01([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\nclass\n C1 : I1<C1>\n{\n static \" + op + @\" I1<C1>.operator int(C1 x) => default;\n}\n\nclass\n C2 : I1<C2>\n{\n private static \" + op + @\" I1<C2>.operator int(C2 x) => default;\n}\n\nclass\n C3 : I1<C3>\n{\n protected static \" + op + @\" I1<C3>.operator int(C3 x) => default;\n}\n\nclass\n C4 : I1<C4>\n{\n internal static \" + op + @\" I1<C4>.operator int(C4 x) => default;\n}\n\nclass\n C5 : I1<C5>\n{\n protected internal static \" + op + @\" I1<C5>.operator int(C5 x) => default;\n}\n\nclass\n C6 : I1<C6>\n{\n private protected static \" + op + @\" I1<C6>.operator int(C6 x) => default;\n}\n\nclass\n C7 : I1<C7>\n{\n public static \" + op + @\" I1<C7>.operator int(C7 x) => default;\n}\n\nclass\n C9 : I1<C9>\n{\n async static \" + op + @\" I1<C9>.operator int(C9 x) => default;\n}\n\nclass\n C10 : I1<C10>\n{\n unsafe static \" + op + @\" I1<C10>.operator int(C10 x) => default;\n}\n\nclass\n C11 : I1<C11>\n{\n static readonly \" + op + @\" I1<C11>.operator int(C11 x) => default;\n}\n\nclass\n C12 : I1<C12>\n{\n extern static \" + op + @\" I1<C12>.operator int(C12 x);\n}\n\nclass\n C13 : I1<C13>\n{\n abstract static \" + op + @\" I1<C13>.operator int(C13 x) => default;\n}\n\nclass\n C14 : I1<C14>\n{\n virtual static \" + op + @\" I1<C14>.operator int(C14 x) => default;\n}\n\nclass\n C15 : I1<C15>\n{\n sealed static \" + op + @\" I1<C15>.operator int(C15 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll.WithAllowUnsafe(true),\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var c1 = compilation1.GlobalNamespace.GetTypeMember(\"C1\");\n\n Assert.Equal(Accessibility.Private, c1.GetMembers().OfType<MethodSymbol>().Where(m => !m.IsConstructor()).Single().DeclaredAccessibility);\n\n compilation1.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.WRN_ExternMethodNoImplementation).Verify(\n // (16,45): error CS0106: The modifier 'private' is not valid for this item\n // private static explicit I1<C2>.operator int(C2 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"private\").WithLocation(16, 45),\n // (22,47): error CS0106: The modifier 'protected' is not valid for this item\n // protected static explicit I1<C3>.operator int(C3 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"protected\").WithLocation(22, 47),\n // (28,46): error CS0106: The modifier 'internal' is not valid for this item\n // internal static explicit I1<C4>.operator int(C4 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"internal\").WithLocation(28, 46),\n // (34,56): error CS0106: The modifier 'protected internal' is not valid for this item\n // protected internal static explicit I1<C5>.operator int(C5 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"protected internal\").WithLocation(34, 56),\n // (40,55): error CS0106: The modifier 'private protected' is not valid for this item\n // private protected static explicit I1<C6>.operator int(C6 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"private protected\").WithLocation(40, 55),\n // (46,44): error CS0106: The modifier 'public' is not valid for this item\n // public static explicit I1<C7>.operator int(C7 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"public\").WithLocation(46, 44),\n // (52,43): error CS0106: The modifier 'async' is not valid for this item\n // async static explicit I1<C9>.operator int(C9 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"async\").WithLocation(52, 43),\n // (64,47): error CS0106: The modifier 'readonly' is not valid for this item\n // static readonly explicit I1<C11>.operator int(C11 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"readonly\").WithLocation(64, 47),\n // (76,47): error CS0106: The modifier 'abstract' is not valid for this item\n // abstract static explicit I1<C13>.operator int(C13 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"abstract\").WithLocation(76, 47),\n // (82,46): error CS0106: The modifier 'virtual' is not valid for this item\n // virtual static explicit I1<C14>.operator int(C14 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"virtual\").WithLocation(82, 46),\n // (88,45): error CS0106: The modifier 'sealed' is not valid for this item\n // sealed static explicit I1<C15>.operator int(C15 x) => default;\n Diagnostic(ErrorCode.ERR_BadMemberFlag, \"int\").WithArguments(\"sealed\").WithLocation(88, 45)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ExplicitInterfaceSpecifierErrorsConversionOperator_01([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : struct, I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\nclass C1\n{\n static \" + op + @\" I1<int>.operator int(int x) => default;\n}\n\nclass C2 : I1<C2>\n{\n static \" + op + @\" I1<C2>.operator int(C2 x) => default;\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (9,21): error CS0540: 'C1.I1<int>.implicit operator int(int)': containing type does not implement interface 'I1<int>'\n // static implicit I1<int>.operator int(int x) => default;\n Diagnostic(ErrorCode.ERR_ClassDoesntImplementInterface, \"I1<int>\").WithArguments(\"C1.I1<int>.\" + op + \" operator int(int)\", \"I1<int>\").WithLocation(9, 21),\n // (9,21): error CS0315: The type 'int' cannot be used as type parameter 'T' in the generic type or method 'I1<T>'. There is no boxing conversion from 'int' to 'I1<int>'.\n // static implicit I1<int>.operator int(int x) => default;\n Diagnostic(ErrorCode.ERR_GenericConstraintNotSatisfiedValType, \"I1<int>\").WithArguments(\"I1<T>\", \"I1<int>\", \"T\", \"int\").WithLocation(9, 21),\n // (12,7): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // class C2 : I1<C2>\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, \"C2\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(12, 7),\n // (14,21): error CS0453: The type 'C2' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'I1<T>'\n // static implicit I1<C2>.operator int(C2 x) => default;\n Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, \"I1<C2>\").WithArguments(\"I1<T>\", \"T\", \"C2\").WithLocation(14, 21)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_01([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n string cast = (op == \"explicit\" ? \"(int)\" : \"\");\n\n var source1 =\n@\"\ninterface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n\n static int M02(I1<T> x)\n {\n return \" + cast + @\"x;\n }\n\n int M03(I1<T> y)\n {\n return \" + cast + @\"y;\n }\n}\n\nclass Test<T> where T : I1<T>\n{\n static int MT1(I1<T> a)\n {\n return \" + cast + @\"a;\n }\n\n static void MT2()\n {\n _ = (System.Linq.Expressions.Expression<System.Func<T, int>>)((T b) => \" + cast + @\"b);\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var error = (op == \"explicit\" ? ErrorCode.ERR_NoExplicitConv : ErrorCode.ERR_NoImplicitConv);\n\n compilation1.VerifyDiagnostics(\n // (8,16): error CS0030: Cannot convert type 'I1<T>' to 'int'\n // return (int)x;\n Diagnostic(error, cast + \"x\").WithArguments(\"I1<T>\", \"int\").WithLocation(8, 16),\n // (13,16): error CS0030: Cannot convert type 'I1<T>' to 'int'\n // return (int)y;\n Diagnostic(error, cast + \"y\").WithArguments(\"I1<T>\", \"int\").WithLocation(13, 16),\n // (21,16): error CS0030: Cannot convert type 'I1<T>' to 'int'\n // return (int)a;\n Diagnostic(error, cast + \"a\").WithArguments(\"I1<T>\", \"int\").WithLocation(21, 16),\n // (26,80): error CS8927: An expression tree may not contain an access of static abstract interface member\n // _ = (System.Linq.Expressions.Expression<System.Func<T, int>>)((T b) => (int)b);\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsAbstractStaticMemberAccess, cast + \"b\").WithLocation(26, 80)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperatorForTupleEquality_01([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\ninterface I1\n{\n abstract static implicit operator bool(I1 x);\n\n\n static void M02((int, C<I1>) x)\n {\n _ = x \" + op + @\" x;\n }\n\n void M03((int, C<I1>) y)\n {\n _ = y \" + op + @\" y;\n }\n}\n\nclass Test\n{\n static void MT1((int, C<I1>) a)\n {\n _ = a \" + op + @\" a;\n }\n\n static void MT2<T>() where T : I1\n {\n _ = (System.Linq.Expressions.Expression<System.Action<(int, C<T>)>>)(((int, C<T>) b) => (b \" + op + @\" b).ToString());\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation1.VerifyDiagnostics(\n // (4,39): error CS0552: 'I1.implicit operator bool(I1)': user-defined conversions to or from an interface are not allowed\n // abstract static implicit operator bool(I1 x);\n Diagnostic(ErrorCode.ERR_ConversionWithInterface, \"bool\").WithArguments(\"I1.implicit operator bool(I1)\").WithLocation(4, 39),\n // (9,13): error CS0029: Cannot implicitly convert type 'I1' to 'bool'\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_NoImplicitConv, \"x \" + op + \" x\").WithArguments(\"I1\", \"bool\").WithLocation(9, 13),\n // (14,13): error CS0029: Cannot implicitly convert type 'I1' to 'bool'\n // _ = y == y;\n Diagnostic(ErrorCode.ERR_NoImplicitConv, \"y \" + op + \" y\").WithArguments(\"I1\", \"bool\").WithLocation(14, 13),\n // (22,13): error CS0029: Cannot implicitly convert type 'I1' to 'bool'\n // _ = a == a;\n Diagnostic(ErrorCode.ERR_NoImplicitConv, \"a \" + op + \" a\").WithArguments(\"I1\", \"bool\").WithLocation(22, 13),\n // (27,98): error CS8382: An expression tree may not contain a tuple == or != operator\n // _ = (System.Linq.Expressions.Expression<System.Action<(int, C<T>)>>)(((int, C<T>) b) => (b == b).ToString());\n Diagnostic(ErrorCode.ERR_ExpressionTreeContainsTupleBinOp, \"b \" + op + \" b\").WithLocation(27, 98)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_03([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : I1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n\n static int? M03<T, U>(T y) where T : U where U : I1<T>\n {\n return \" + (needCast ? \"(int?)\" : \"\") + @\"y;\n }\n\n static int? M04<T, U>(T? y) where T : struct, U where U : I1<T>\n {\n return \" + (needCast ? \"(int?)\" : \"\") + @\"y;\n }\n\n static int? M05<T, U>() where T : struct, U where U : I1<T>\n {\n return \" + (needCast ? \"(int?)\" : \"\") + @\"(T?)new T();\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (int V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 23 (0x17)\n .maxstack 1\n .locals init (int? V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: newobj \"\"int?..ctor(int)\"\"\n IL_0012: stloc.0\n IL_0013: br.s IL_0015\n IL_0015: ldloc.0\n IL_0016: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 1\n .locals init (T? V_0,\n int? V_1,\n int? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool T?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"int?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002e\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0029: newobj \"\"int?..ctor(int)\"\"\n IL_002e: stloc.2\n IL_002f: br.s IL_0031\n IL_0031: ldloc.2\n IL_0032: ret\n}\n\");\n verifier.VerifyIL(\"Test.M05<T, U>()\",\n@\"\n{\n // Code size 27 (0x1b)\n .maxstack 1\n .locals init (int? V_0)\n IL_0000: nop\n IL_0001: call \"\"T System.Activator.CreateInstance<T>()\"\"\n IL_0006: constrained. \"\"T\"\"\n IL_000c: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0011: newobj \"\"int?..ctor(int)\"\"\n IL_0016: stloc.0\n IL_0017: br.s IL_0019\n IL_0019: ldloc.0\n IL_001a: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000c: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000c: newobj \"\"int?..ctor(int)\"\"\n IL_0011: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(T?)\",\n@\"\n{\n // Code size 45 (0x2d)\n .maxstack 1\n .locals init (T? V_0,\n int? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool T?.HasValue.get\"\"\n IL_0009: brtrue.s IL_0015\n IL_000b: ldloca.s V_1\n IL_000d: initobj \"\"int?\"\"\n IL_0013: ldloc.1\n IL_0014: ret\n IL_0015: ldloca.s V_0\n IL_0017: call \"\"readonly T T?.GetValueOrDefault()\"\"\n IL_001c: constrained. \"\"T\"\"\n IL_0022: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0027: newobj \"\"int?..ctor(int)\"\"\n IL_002c: ret\n}\n\");\n verifier.VerifyIL(\"Test.M05<T, U>()\",\n@\"\n{\n // Code size 22 (0x16)\n .maxstack 1\n IL_0000: call \"\"T System.Activator.CreateInstance<T>()\"\"\n IL_0005: constrained. \"\"T\"\"\n IL_000b: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_0010: newobj \"\"int?..ctor(int)\"\"\n IL_0015: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<ReturnStatementSyntax>().First();\n\n Assert.Equal(\"return \" + (needCast ? \"(int)\" : \"\") + @\"x;\", node.ToString());\n\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return \" + (needCast ? \"(int)\" : \"\") + @\"x;')\n ReturnedValue: \n IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: System.Int32 I1<T>.\" + metadataName + @\"(T x)) (OperationKind.Conversion, Type: System.Int32\" + (needCast ? \"\" : \", IsImplicit\") + @\") (Syntax: '\" + (needCast ? \"(int)\" : \"\") + @\"x')\n Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: True) (MethodSymbol: System.Int32 I1<T>.\" + metadataName + @\"(T x))\n Operand: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: T) (Syntax: 'x')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperatorForTupleEquality_03([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static implicit operator bool (T x);\n}\n\nclass Test\n{\n static void M02<T, U>((int, C<T>) x) where T : U where U : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 52 (0x34)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0011: bne.un.s IL_0031\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001f: call \"\"T C<T>.op_Equality(C<T>, C<T>)\"\"\n IL_0024: constrained. \"\"T\"\"\n IL_002a: call \"\"bool I1<T>.op_Implicit(T)\"\"\n IL_002f: br.s IL_0032\n IL_0031: ldc.i4.0\n IL_0032: pop\n IL_0033: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 52 (0x34)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldarg.0\n IL_0004: stloc.1\n IL_0005: ldloc.0\n IL_0006: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000b: ldloc.1\n IL_000c: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0011: bne.un.s IL_0031\n IL_0013: ldloc.0\n IL_0014: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0019: ldloc.1\n IL_001a: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001f: call \"\"T C<T>.op_Inequality(C<T>, C<T>)\"\"\n IL_0024: constrained. \"\"T\"\"\n IL_002a: call \"\"bool I1<T>.op_Implicit(T)\"\"\n IL_002f: br.s IL_0032\n IL_0031: ldc.i4.1\n IL_0032: pop\n IL_0033: ret\n}\n\");\n }\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n\n if (op == \"==\")\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0010: bne.un.s IL_0030\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001e: call \"\"T C<T>.op_Equality(C<T>, C<T>)\"\"\n IL_0023: constrained. \"\"T\"\"\n IL_0029: call \"\"bool I1<T>.op_Implicit(T)\"\"\n IL_002e: br.s IL_0031\n IL_0030: ldc.i4.0\n IL_0031: pop\n IL_0032: ret\n}\n\");\n }\n else\n {\n verifier.VerifyIL(\"Test.M02<T, U>(System.ValueTuple<int, C<T>>)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 2\n .locals init (System.ValueTuple<int, C<T>> V_0,\n System.ValueTuple<int, C<T>> V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldarg.0\n IL_0003: stloc.1\n IL_0004: ldloc.0\n IL_0005: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_000a: ldloc.1\n IL_000b: ldfld \"\"int System.ValueTuple<int, C<T>>.Item1\"\"\n IL_0010: bne.un.s IL_0030\n IL_0012: ldloc.0\n IL_0013: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_0018: ldloc.1\n IL_0019: ldfld \"\"C<T> System.ValueTuple<int, C<T>>.Item2\"\"\n IL_001e: call \"\"T C<T>.op_Inequality(C<T>, C<T>)\"\"\n IL_0023: constrained. \"\"T\"\"\n IL_0029: call \"\"bool I1<T>.op_Implicit(T)\"\"\n IL_002e: br.s IL_0031\n IL_0030: ldc.i4.1\n IL_0031: pop\n IL_0032: ret\n}\n\");\n }\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().First();\n\n Assert.Equal(\"x \" + op + \" x\", node.ToString());\n VerifyOperationTreeForNode(compilation1, model, node,\n// Information about user-defined operators isn't exposed today.\n@\"\nITupleBinaryOperation (BinaryOperatorKind.\" + (op == \"==\" ? \"Equals\" : \"NotEquals\") + @\") (OperationKind.TupleBinary, Type: System.Boolean) (Syntax: 'x \" + op + @\" x')\n Left: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, C<T>)) (Syntax: 'x')\n Right: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: (System.Int32, C<T>)) (Syntax: 'x')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_04([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static int M02<T>(T x) where T : I1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,16): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // return (int)x;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, (needCast ? \"(int)\" : \"\") + \"x\").WithLocation(6, 16)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (12,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static explicit operator int(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"int\").WithLocation(12, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperatorForTupleEquality_04([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static implicit operator bool(T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, C<T>) x) where T : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"x \" + op + \" x\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: TargetFramework.DesktopLatestExtended);\n\n compilation3.VerifyDiagnostics(\n // (21,39): error CS8919: Target runtime doesn't support static abstract members in interfaces.\n // abstract static implicit operator bool(T x);\n Diagnostic(ErrorCode.ERR_RuntimeDoesNotSupportStaticAbstractMembersInInterfaces, \"bool\").WithLocation(21, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_06([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static int M02<T>(T x) where T : I1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,16): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // return x;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, (needCast ? \"(int)\" : \"\") + \"x\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 16)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.GetDiagnostics().Where(d => d.Code is not (int)ErrorCode.ERR_OperatorNeedsMatch).Verify(\n // (12,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static implicit operator int(T x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"int\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(12, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperatorForTupleEquality_06([CombinatorialValues(\"==\", \"!=\")] string op)\n {\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static implicit operator bool(T x);\n}\n\";\n var source2 =\n@\"\nclass Test\n{\n static void M02<T>((int, C<T>) x) where T : I1<T>\n {\n _ = x \" + op + @\" x;\n }\n}\n\n#pragma warning disable CS0660 // 'C<T>' defines operator == or operator != but does not override Object.Equals(object o)\n#pragma warning disable CS0661 // 'C<T>' defines operator == or operator != but does not override Object.GetHashCode()\n\nclass C<T>\n{\n public static T operator == (C<T> x, C<T> y) => default;\n public static T operator != (C<T> x, C<T> y) => default;\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework,\n references: new[] { compilation1.ToMetadataReference() });\n\n compilation2.VerifyDiagnostics(\n // (6,13): error CS8652: The feature 'static abstract members in interfaces' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.\n // _ = x == x;\n Diagnostic(ErrorCode.ERR_FeatureInPreview, \"x \" + op + \" x\").WithArguments(\"static abstract members in interfaces\").WithLocation(6, 13)\n );\n\n var compilation3 = CreateCompilation(source2 + source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.Regular9,\n targetFramework: _supportingFramework);\n\n compilation3.VerifyDiagnostics(\n // (21,39): error CS8703: The modifier 'abstract' is not valid for this item in C# 9.0. Please use language version 'preview' or greater.\n // abstract static implicit operator bool(T x);\n Diagnostic(ErrorCode.ERR_InvalidModifierForLanguageVersion, \"bool\").WithArguments(\"abstract\", \"9.0\", \"preview\").WithLocation(21, 39)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_07([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Same as ConsumeAbstractConversionOperator_03 only direction of conversion is flipped\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator T(int x);\n}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : I1<T>\n {\n return \" + (needCast ? \"(T)\" : \"\") + @\"x;\n }\n\n static T? M03<T, U>(int y) where T : struct, U where U : I1<T>\n {\n return \" + (needCast ? \"(T?)\" : \"\") + @\"y;\n }\n\n static T? M04<T, U>(int? y) where T : struct, U where U : I1<T>\n {\n return \" + (needCast ? \"(T?)\" : \"\") + @\"y;\n }\n\n static T? M05<T, U>() where T : struct, U where U : I1<T>\n {\n return \" + (needCast ? \"(T?)\" : \"\") + @\"(T?)0;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(int)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(int)\",\n@\"\n{\n // Code size 23 (0x17)\n .maxstack 1\n .locals init (T? V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000d: newobj \"\"T?..ctor(T)\"\"\n IL_0012: stloc.0\n IL_0013: br.s IL_0015\n IL_0015: ldloc.0\n IL_0016: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(int?)\",\n@\"\n{\n // Code size 51 (0x33)\n .maxstack 1\n .locals init (int? V_0,\n T? V_1,\n T? V_2)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: stloc.0\n IL_0003: ldloca.s V_0\n IL_0005: call \"\"readonly bool int?.HasValue.get\"\"\n IL_000a: brtrue.s IL_0017\n IL_000c: ldloca.s V_1\n IL_000e: initobj \"\"T?\"\"\n IL_0014: ldloc.1\n IL_0015: br.s IL_002e\n IL_0017: ldloca.s V_0\n IL_0019: call \"\"readonly int int?.GetValueOrDefault()\"\"\n IL_001e: constrained. \"\"T\"\"\n IL_0024: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_0029: newobj \"\"T?..ctor(T)\"\"\n IL_002e: stloc.2\n IL_002f: br.s IL_0031\n IL_0031: ldloc.2\n IL_0032: ret\n}\n\");\n verifier.VerifyIL(\"Test.M05<T, U>()\",\n@\"\n{\n // Code size 23 (0x17)\n .maxstack 1\n .locals init (T? V_0)\n IL_0000: nop\n IL_0001: ldc.i4.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000d: newobj \"\"T?..ctor(T)\"\"\n IL_0012: stloc.0\n IL_0013: br.s IL_0015\n IL_0015: ldloc.0\n IL_0016: ret\n}\n\");\n\n compilation1 = CreateCompilation(source1, options: TestOptions.ReleaseDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(int)\",\n@\"\n{\n // Code size 13 (0xd)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000c: ret\n}\n\");\n verifier.VerifyIL(\"Test.M03<T, U>(int)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n IL_0000: ldarg.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000c: newobj \"\"T?..ctor(T)\"\"\n IL_0011: ret\n}\n\");\n verifier.VerifyIL(\"Test.M04<T, U>(int?)\",\n@\"\n{\n // Code size 45 (0x2d)\n .maxstack 1\n .locals init (int? V_0,\n T? V_1)\n IL_0000: ldarg.0\n IL_0001: stloc.0\n IL_0002: ldloca.s V_0\n IL_0004: call \"\"readonly bool int?.HasValue.get\"\"\n IL_0009: brtrue.s IL_0015\n IL_000b: ldloca.s V_1\n IL_000d: initobj \"\"T?\"\"\n IL_0013: ldloc.1\n IL_0014: ret\n IL_0015: ldloca.s V_0\n IL_0017: call \"\"readonly int int?.GetValueOrDefault()\"\"\n IL_001c: constrained. \"\"T\"\"\n IL_0022: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_0027: newobj \"\"T?..ctor(T)\"\"\n IL_002c: ret\n}\n\");\n verifier.VerifyIL(\"Test.M05<T, U>()\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n IL_0000: ldc.i4.0\n IL_0001: constrained. \"\"T\"\"\n IL_0007: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000c: newobj \"\"T?..ctor(T)\"\"\n IL_0011: ret\n}\n\");\n\n var tree = compilation1.SyntaxTrees.Single();\n var model = compilation1.GetSemanticModel(tree);\n var node = tree.GetRoot().DescendantNodes().OfType<ReturnStatementSyntax>().First();\n\n Assert.Equal(\"return \" + (needCast ? \"(T)\" : \"\") + @\"x;\", node.ToString());\n\n VerifyOperationTreeForNode(compilation1, model, node,\n// https://github.com/dotnet/roslyn/issues/53803: It feels like the \"T\" constraint is important for this operator, but it is not \n// reflected in the IOperation tree. Should we change the shape of the tree in order\n// to expose this information? \n@\"\nIReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return \" + (needCast ? \"(T)\" : \"\") + @\"x;')\n ReturnedValue: \n IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: T I1<T>.\" + metadataName + @\"(System.Int32 x)) (OperationKind.Conversion, Type: T\" + (needCast ? \"\" : \", IsImplicit\") + @\") (Syntax: '\" + (needCast ? \"(T)\" : \"\") + @\"x')\n Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: True) (MethodSymbol: T I1<T>.\" + metadataName + @\"(System.Int32 x))\n Operand: \n IParameterReferenceOperation: x (OperationKind.ParameterReference, Type: System.Int32) (Syntax: 'x')\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_08([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Don't look in interfaces of the effective base\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\nclass C1<T> : I1<C1<T>>\n{\n static \" + op + @\" I1<C1<T>>.operator int(C1<T> x) => default;\n}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : C1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n\n static int M03<T>(C1<T> y) where T : I1<C1<T>>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var error = (op == \"explicit\" ? ErrorCode.ERR_NoExplicitConv : ErrorCode.ERR_NoImplicitConv);\n\n compilation1.VerifyDiagnostics(\n // (16,16): error CS0030: Cannot convert type 'T' to 'int'\n // return (int)x;\n Diagnostic(error, (needCast ? \"(int)\" : \"\") + \"x\").WithArguments(\"T\", \"int\").WithLocation(16, 16),\n // (21,16): error CS0030: Cannot convert type 'C1<T>' to 'int'\n // return (int)y;\n Diagnostic(error, (needCast ? \"(int)\" : \"\") + \"y\").WithArguments(\"C1<T>\", \"int\").WithLocation(21, 16)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_09([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Same as ConsumeAbstractConversionOperator_08 only direction of conversion is flipped\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator T(int x);\n}\n\nclass C1<T> : I1<C1<T>>\n{\n static \" + op + @\" I1<C1<T>>.operator C1<T>(int x) => default;\n}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : C1<T>\n {\n return \" + (needCast ? \"(T)\" : \"\") + @\"x;\n }\n\n static C1<T> M03<T>(int y) where T : I1<C1<T>>\n {\n return \" + (needCast ? \"(C1<T>)\" : \"\") + @\"y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var error = (op == \"explicit\" ? ErrorCode.ERR_NoExplicitConv : ErrorCode.ERR_NoImplicitConv);\n\n compilation1.VerifyDiagnostics(\n // (16,16): error CS0030: Cannot convert type 'int' to 'T'\n // return (T)x;\n Diagnostic(error, (needCast ? \"(T)\" : \"\") + \"x\").WithArguments(\"int\", \"T\").WithLocation(16, 16),\n // (21,16): error CS0030: Cannot convert type 'int' to 'C1<T>'\n // return (C1<T>)y;\n Diagnostic(error, (needCast ? \"(C1<T>)\" : \"\") + \"y\").WithArguments(\"int\", \"C1<T>\").WithLocation(21, 16)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_10([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Look in derived interfaces\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\npublic interface I2<T> : I1<T> where T : I1<T>\n{}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : I2<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (int V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"int I1<T>.\" + metadataName + @\"(T)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_11([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Same as ConsumeAbstractConversionOperator_10 only direction of conversion is flipped\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator T(int x);\n}\n\npublic interface I2<T> : I1<T> where T : I1<T>\n{}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : I2<T>\n {\n return \" + (needCast ? \"(T)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(int)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"T I1<T>.\" + metadataName + @\"(int)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_12([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Ignore duplicate candidates\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T, U> where T : I1<T, U> where U : I1<T, U>\n{\n abstract static \" + op + @\" operator U(T x);\n}\n\nclass Test\n{\n static U M02<T, U>(T x) where T : I1<T, U> where U : I1<T, U>\n {\n return \" + (needCast ? \"(U)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 18 (0x12)\n .maxstack 1\n .locals init (U V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: constrained. \"\"T\"\"\n IL_0008: call \"\"U I1<T, U>.\" + metadataName + @\"(T)\"\"\n IL_000d: stloc.0\n IL_000e: br.s IL_0010\n IL_0010: ldloc.0\n IL_0011: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_13([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Look in effective base\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic class C1<T>\n{\n public static \" + op + @\" operator int(C1<T> x) => default;\n}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : C1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 1\n .locals init (int V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T\"\"\n IL_0007: call \"\"int C1<T>.\" + metadataName + @\"(C1<T>)\"\"\n IL_000c: stloc.0\n IL_000d: br.s IL_000f\n IL_000f: ldloc.0\n IL_0010: ret\n}\n\");\n }\n\n [Fact]\n public void ConsumeAbstractConversionOperator_14()\n {\n // Same as ConsumeAbstractConversionOperator_13 only direction of conversion is flipped\n var source1 =\n@\"\npublic class C1<T>\n{\n public static explicit operator C1<T>(int x) => default;\n}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : C1<T>\n {\n return (T)x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(int)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 1\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: call \"\"C1<T> C1<T>.op_Explicit(int)\"\"\n IL_0007: unbox.any \"\"T\"\"\n IL_000c: stloc.0\n IL_000d: br.s IL_000f\n IL_000f: ldloc.0\n IL_0010: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_15([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // If there is a non-trivial class constraint, interfaces are not looked at.\n\n string metadataName = ConversionOperatorName(op);\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\npublic class C1 : I1<C1>\n{\n public static \" + op + @\" operator int(C1 x) => default;\n}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : C1, I1<C1>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(T)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 1\n .locals init (int V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: box \"\"T\"\"\n IL_0007: call \"\"int C1.\" + metadataName + @\"(C1)\"\"\n IL_000c: stloc.0\n IL_000d: br.s IL_000f\n IL_000f: ldloc.0\n IL_0010: ret\n}\n\");\n }\n\n [Fact]\n public void ConsumeAbstractConversionOperator_16()\n {\n // Same as ConsumeAbstractConversionOperator_15 only direction of conversion is flipped\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static explicit operator T(int x);\n}\n\npublic class C1 : I1<C1>\n{\n public static explicit operator C1(int x) => default;\n}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : C1, I1<C1>\n {\n return (T)x;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n var verifier = CompileAndVerify(compilation1, verify: Verification.Skipped).VerifyDiagnostics();\n\n verifier.VerifyIL(\"Test.M02<T, U>(int)\",\n@\"\n{\n // Code size 17 (0x11)\n .maxstack 1\n .locals init (T V_0)\n IL_0000: nop\n IL_0001: ldarg.0\n IL_0002: call \"\"C1 C1.op_Explicit(int)\"\"\n IL_0007: unbox.any \"\"T\"\"\n IL_000c: stloc.0\n IL_000d: br.s IL_000f\n IL_000f: ldloc.0\n IL_0010: ret\n}\n\");\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_17([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // If there is a non-trivial class constraint, interfaces are not looked at.\n\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator int(T x);\n}\n\npublic class C1 \n{\n}\n\nclass Test\n{\n static int M02<T, U>(T x) where T : U where U : C1, I1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"x;\n }\n\n static int M03<T, U>(T y) where T : U where U : I1<T>\n {\n return \" + (needCast ? \"(int)\" : \"\") + @\"y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (15,16): error CS0030: Cannot convert type 'T' to 'int'\n // return (int)x;\n Diagnostic((op == \"explicit\" ? ErrorCode.ERR_NoExplicitConv : ErrorCode.ERR_NoImplicitConv), (needCast ? \"(int)\" : \"\") + \"x\").WithArguments(\"T\", \"int\").WithLocation(15, 16)\n );\n }\n\n [Theory]\n [CombinatorialData]\n public void ConsumeAbstractConversionOperator_18([CombinatorialValues(\"implicit\", \"explicit\")] string op)\n {\n // Same as ConsumeAbstractConversionOperator_17 only direction of conversion is flipped\n\n bool needCast = op == \"explicit\";\n\n var source1 =\n@\"\npublic interface I1<T> where T : I1<T>\n{\n abstract static \" + op + @\" operator T(int x);\n}\n\npublic class C1 \n{\n}\n\nclass Test\n{\n static T M02<T, U>(int x) where T : U where U : C1, I1<T>\n {\n return \" + (needCast ? \"(T)\" : \"\") + @\"x;\n }\n\n static T M03<T, U>(int y) where T : U where U : I1<T>\n {\n return \" + (needCast ? \"(T)\" : \"\") + @\"y;\n }\n}\n\";\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n compilation1.VerifyDiagnostics(\n // (15,16): error CS0030: Cannot convert type 'int' to 'T'\n // return (T)x;\n Diagnostic((op == \"explicit\" ? ErrorCode.ERR_NoExplicitConv : ErrorCode.ERR_NoImplicitConv), (needCast ? \"(T)\" : \"\") + \"x\").WithArguments(\"int\", \"T\").WithLocation(15, 16)\n );\n }\n\n [Fact]\n [WorkItem(53802, \"https://github.com/dotnet/roslyn/issues/53802\")]\n public void TestAmbiguousImplementationMethod_01()\n {\n var source1 = @\"\npublic interface Interface<T, U>\n{\n abstract static void Method(int i);\n abstract static void Method(T i);\n abstract static void Method(U i);\n}\n\npublic class Base<T> : Interface<T, T>\n{\n public static void Method(int i) { }\n public static void Method(T i) { }\n}\n\npublic class Derived : Base<int>, Interface<int, int>\n{\n}\n\nclass YetAnother : Interface<int, int>\n{\n public static void Method(int i) { }\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var b = module.GlobalNamespace.GetTypeMember(\"Base\");\n var bI = b.Interfaces().Single();\n var biMethods = bI.GetMembers();\n\n Assert.Equal(\"void Interface<T, U>.Method(System.Int32 i)\", biMethods[0].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(T i)\", biMethods[1].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(U i)\", biMethods[2].OriginalDefinition.ToTestDisplayString());\n\n var bM1 = b.FindImplementationForInterfaceMember(biMethods[0]);\n\n Assert.Equal(\"void Base<T>.Method(System.Int32 i)\", bM1.ToTestDisplayString());\n\n var bM2 = b.FindImplementationForInterfaceMember(biMethods[1]);\n\n Assert.Equal(\"void Base<T>.Method(T i)\", bM2.ToTestDisplayString());\n Assert.Same(bM2, b.FindImplementationForInterfaceMember(biMethods[2]));\n\n var bM1Impl = ((MethodSymbol)bM1).ExplicitInterfaceImplementations;\n var bM2Impl = ((MethodSymbol)bM2).ExplicitInterfaceImplementations;\n\n if (module is PEModuleSymbol)\n {\n Assert.Equal(biMethods[0], bM1Impl.Single());\n\n Assert.Equal(2, bM2Impl.Length);\n Assert.Equal(biMethods[1], bM2Impl[0]);\n Assert.Equal(biMethods[2], bM2Impl[1]);\n }\n else\n {\n Assert.Empty(bM1Impl);\n Assert.Empty(bM2Impl);\n }\n\n var d = module.GlobalNamespace.GetTypeMember(\"Derived\");\n var dB = d.BaseTypeNoUseSiteDiagnostics;\n var dI = d.Interfaces().Single();\n var diMethods = dI.GetMembers();\n\n Assert.Equal(\"void Interface<T, U>.Method(System.Int32 i)\", diMethods[0].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(T i)\", diMethods[1].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(U i)\", diMethods[2].OriginalDefinition.ToTestDisplayString());\n\n var dM1 = d.FindImplementationForInterfaceMember(diMethods[0]);\n\n Assert.Same(bM1, dM1.OriginalDefinition);\n\n var dM2 = d.FindImplementationForInterfaceMember(diMethods[1]);\n\n Assert.Same(bM2, dM2.OriginalDefinition);\n Assert.Same(bM2, d.FindImplementationForInterfaceMember(diMethods[2]).OriginalDefinition);\n }\n }\n\n [Fact]\n [WorkItem(53802, \"https://github.com/dotnet/roslyn/issues/53802\")]\n public void TestAmbiguousImplementationMethod_02()\n {\n var source0 = @\"\npublic interface Interface<T, U>\n{\n abstract static void Method(int i);\n abstract static void Method(T i);\n abstract static void Method(U i);\n}\n\npublic class Base<T> : Interface<T, T>\n{\n public static void Method(int i) { }\n public static void Method(T i) { }\n}\n\";\n\n var compilation0 = CreateCompilation(source0, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation0.VerifyDiagnostics();\n\n var source1 = @\"\npublic class Derived : Base<int>, Interface<int, int>\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation0.EmitToImageReference() });\n\n CompileAndVerify(compilation1, sourceSymbolValidator: validate, symbolValidator: validate, verify: Verification.Skipped).VerifyDiagnostics();\n\n void validate(ModuleSymbol module)\n {\n var d = module.GlobalNamespace.GetTypeMember(\"Derived\");\n var dB = d.BaseTypeNoUseSiteDiagnostics;\n var dI = d.Interfaces().Single();\n var diMethods = dI.GetMembers();\n\n Assert.Equal(\"void Interface<T, U>.Method(System.Int32 i)\", diMethods[0].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(T i)\", diMethods[1].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(U i)\", diMethods[2].OriginalDefinition.ToTestDisplayString());\n\n var dM1 = d.FindImplementationForInterfaceMember(diMethods[0]);\n\n Assert.Equal(\"void Base<T>.Method(System.Int32 i)\", dM1.OriginalDefinition.ToTestDisplayString());\n\n var dM2 = d.FindImplementationForInterfaceMember(diMethods[1]);\n\n Assert.Equal(\"void Base<T>.Method(T i)\", dM2.OriginalDefinition.ToTestDisplayString());\n Assert.Same(dM2, d.FindImplementationForInterfaceMember(diMethods[2]));\n\n var dM1Impl = ((MethodSymbol)dM1).ExplicitInterfaceImplementations;\n var dM2Impl = ((MethodSymbol)dM2).ExplicitInterfaceImplementations;\n\n Assert.Equal(diMethods[0], dM1Impl.Single());\n\n Assert.Equal(2, dM2Impl.Length);\n Assert.Equal(diMethods[1], dM2Impl[0]);\n Assert.Equal(diMethods[2], dM2Impl[1]);\n }\n }\n\n [Fact]\n [WorkItem(53802, \"https://github.com/dotnet/roslyn/issues/53802\")]\n public void TestAmbiguousImplementationMethod_03()\n {\n var source0 = @\"\npublic interface Interface<T, U>\n{\n abstract static void Method(int i);\n abstract static void Method(T i);\n abstract static void Method(U i);\n}\n\npublic class Base<T> : Interface<T, T>\n{\n public static void Method(int i) { }\n public static void Method(T i) { }\n}\n\";\n\n var compilation0 = CreateCompilation(source0, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { CreateEmptyCompilation(\"\").ToMetadataReference() });\n\n compilation0.VerifyDiagnostics();\n\n var source1 = @\"\npublic class Derived : Base<int>, Interface<int, int>\n{\n}\n\";\n\n var compilation1 = CreateCompilation(source1, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework,\n references: new[] { compilation0.ToMetadataReference() });\n\n var d = compilation1.GlobalNamespace.GetTypeMember(\"Derived\");\n var dB = d.BaseTypeNoUseSiteDiagnostics;\n var dI = d.Interfaces().Single();\n var diMethods = dI.GetMembers();\n\n Assert.IsType<RetargetingNamedTypeSymbol>(dB.OriginalDefinition);\n\n Assert.Equal(\"void Interface<T, U>.Method(System.Int32 i)\", diMethods[0].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(T i)\", diMethods[1].OriginalDefinition.ToTestDisplayString());\n Assert.Equal(\"void Interface<T, U>.Method(U i)\", diMethods[2].OriginalDefinition.ToTestDisplayString());\n\n var dM1 = d.FindImplementationForInterfaceMember(diMethods[0]);\n\n Assert.Equal(\"void Base<T>.Method(System.Int32 i)\", dM1.OriginalDefinition.ToTestDisplayString());\n\n var dM2 = d.FindImplementationForInterfaceMember(diMethods[1]);\n\n Assert.Equal(\"void Base<T>.Method(T i)\", dM2.OriginalDefinition.ToTestDisplayString());\n Assert.Equal(dM2, d.FindImplementationForInterfaceMember(diMethods[2]));\n\n var dM1Impl = ((MethodSymbol)dM1).ExplicitInterfaceImplementations;\n var dM2Impl = ((MethodSymbol)dM2).ExplicitInterfaceImplementations;\n\n Assert.Empty(dM1Impl);\n Assert.Empty(dM2Impl);\n }\n\n [Fact]\n [WorkItem(53802, \"https://github.com/dotnet/roslyn/issues/53802\")]\n public void TestAmbiguousImplementationMethod_04()\n {\n var source2 = @\"\npublic interface Interface<T, U>\n{\n abstract static void Method(int i);\n abstract static void Method(T i);\n abstract static void Method(U i);\n}\n\nclass Other : Interface<int, int>\n{\n static void Interface<int, int>.Method(int i) { }\n}\n\";\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (9,15): error CS0535: 'Other' does not implement interface member 'Interface<int, int>.Method(int)'\n // class Other : Interface<int, int>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"Interface<int, int>\").WithArguments(\"Other\", \"Interface<int, int>.Method(int)\").WithLocation(9, 15),\n // (9,15): error CS0535: 'Other' does not implement interface member 'Interface<int, int>.Method(int)'\n // class Other : Interface<int, int>\n Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, \"Interface<int, int>\").WithArguments(\"Other\", \"Interface<int, int>.Method(int)\").WithLocation(9, 15),\n // (11,37): warning CS0473: Explicit interface implementation 'Other.Interface<int, int>.Method(int)' matches more than one interface member. Which interface member is actually chosen is implementation-dependent. Consider using a non-explicit implementation instead.\n // static void Interface<int, int>.Method(int i) { }\n Diagnostic(ErrorCode.WRN_ExplicitImplCollision, \"Method\").WithArguments(\"Other.Interface<int, int>.Method(int)\").WithLocation(11, 37)\n );\n }\n\n [Fact]\n public void UnmanagedCallersOnly_01()\n {\n var source2 = @\"\nusing System.Runtime.InteropServices;\n\npublic interface I1\n{\n [UnmanagedCallersOnly] abstract static void M1();\n [UnmanagedCallersOnly] abstract static int operator +(I1 x);\n [UnmanagedCallersOnly] abstract static int operator +(I1 x, I1 y);\n}\n\npublic interface I2<T> where T : I2<T>\n{\n [UnmanagedCallersOnly] abstract static implicit operator int(T i);\n [UnmanagedCallersOnly] abstract static explicit operator T(int i);\n}\n\";\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (6,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] abstract static void M1();\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(6, 6),\n // (7,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] abstract static int operator +(I1 x);\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(7, 6),\n // (8,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] abstract static int operator +(I1 x, I1 y);\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(8, 6),\n // (13,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] abstract static implicit operator int(T i);\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(13, 6),\n // (14,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] abstract static explicit operator T(int i);\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(14, 6)\n );\n }\n\n [Fact]\n [WorkItem(54113, \"https://github.com/dotnet/roslyn/issues/54113\")]\n public void UnmanagedCallersOnly_02()\n {\n var ilSource = @\"\n.class public auto ansi sealed beforefieldinit System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute\n extends [mscorlib]System.Attribute\n{\n .custom instance void [mscorlib]System.AttributeUsageAttribute::.ctor(valuetype [mscorlib]System.AttributeTargets) = (\n 01 00 40 00 00 00 01 00 54 02 09 49 6e 68 65 72\n 69 74 65 64 00\n )\n .field public class [mscorlib]System.Type[] CallConvs\n .field public string EntryPoint\n\n .method public hidebysig specialname rtspecialname \n instance void .ctor () cil managed \n {\n ldarg.0\n call instance void [mscorlib]System.Attribute::.ctor()\n ret\n }\n}\n\n.class interface public auto ansi abstract I1\n{\n .method public hidebysig abstract virtual static \n void M1 () cil managed \n {\n // [System.Runtime.InteropServices.UnmanagedCallersOnly]\n .custom instance void System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute::.ctor() = (\n 01 00 00 00\n )\n }\n\n .method public hidebysig specialname abstract virtual static \n int32 op_UnaryPlus (\n class I1 x\n ) cil managed \n {\n // [System.Runtime.InteropServices.UnmanagedCallersOnly]\n .custom instance void System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute::.ctor() = (\n 01 00 00 00\n )\n }\n\n .method public hidebysig specialname abstract virtual static \n int32 op_Addition (\n class I1 x,\n class I1 y\n ) cil managed \n {\n // [System.Runtime.InteropServices.UnmanagedCallersOnly]\n .custom instance void System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute::.ctor() = (\n 01 00 00 00\n )\n }\n}\n\n.class interface public auto ansi abstract I2`1<(class I2`1<!T>) T>\n{\n .method public hidebysig specialname abstract virtual static \n int32 op_Implicit (\n !T i\n ) cil managed \n {\n // [System.Runtime.InteropServices.UnmanagedCallersOnly]\n .custom instance void System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute::.ctor() = (\n 01 00 00 00\n )\n }\n\n .method public hidebysig specialname abstract virtual static \n !T op_Explicit (\n int32 i\n ) cil managed \n {\n // [System.Runtime.InteropServices.UnmanagedCallersOnly]\n .custom instance void System.Runtime.InteropServices.UnmanagedCallersOnlyAttribute::.ctor() = (\n 01 00 00 00\n )\n }\n}\n\";\n\n var source1 =\n@\"\nclass Test\n{\n static void M02<T>(T x, T y) where T : I1\n {\n T.M1();\n _ = +x;\n _ = x + y;\n }\n\n static int M03<T>(T x) where T : I2<T>\n {\n _ = (T)x;\n return x;\n }\n}\n\";\n var compilation1 = CreateCompilationWithIL(source1, ilSource, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n // Conversions aren't flagged due to https://github.com/dotnet/roslyn/issues/54113.\n compilation1.VerifyDiagnostics(\n // (6,11): error CS0570: 'I1.M1()' is not supported by the language\n // T.M1();\n Diagnostic(ErrorCode.ERR_BindToBogus, \"M1\").WithArguments(\"I1.M1()\").WithLocation(6, 11),\n // (7,13): error CS0570: 'I1.operator +(I1)' is not supported by the language\n // _ = +x;\n Diagnostic(ErrorCode.ERR_BindToBogus, \"+x\").WithArguments(\"I1.operator +(I1)\").WithLocation(7, 13),\n // (8,13): error CS0570: 'I1.operator +(I1, I1)' is not supported by the language\n // _ = x + y;\n Diagnostic(ErrorCode.ERR_BindToBogus, \"x + y\").WithArguments(\"I1.operator +(I1, I1)\").WithLocation(8, 13)\n );\n }\n\n [Fact]\n public void UnmanagedCallersOnly_03()\n {\n var source2 = @\"\nusing System.Runtime.InteropServices;\n\npublic interface I1<T> where T : I1<T>\n{\n abstract static void M1();\n abstract static int operator +(T x);\n abstract static int operator +(T x, T y);\n abstract static implicit operator int(T i);\n abstract static explicit operator T(int i);\n}\n\nclass C : I1<C>\n{\n [UnmanagedCallersOnly] public static void M1() {}\n [UnmanagedCallersOnly] public static int operator +(C x) => 0;\n [UnmanagedCallersOnly] public static int operator +(C x, C y) => 0;\n [UnmanagedCallersOnly] public static implicit operator int(C i) => 0;\n [UnmanagedCallersOnly] public static explicit operator C(int i) => null;\n}\n\";\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (15,47): error CS8932: 'UnmanagedCallersOnly' method 'C.M1()' cannot implement interface member 'I1<C>.M1()' in type 'C'\n // [UnmanagedCallersOnly] public static void M1() {}\n Diagnostic(ErrorCode.ERR_InterfaceImplementedByUnmanagedCallersOnlyMethod, \"M1\").WithArguments(\"C.M1()\", \"I1<C>.M1()\", \"C\").WithLocation(15, 47),\n // (16,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] public static int operator +(C x) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(16, 6),\n // (17,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] public static int operator +(C x, C y) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(17, 6),\n // (18,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] public static implicit operator int(C i) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(18, 6),\n // (19,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] public static explicit operator C(int i) => null;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(19, 6)\n );\n }\n\n [Fact]\n public void UnmanagedCallersOnly_04()\n {\n var source2 = @\"\nusing System.Runtime.InteropServices;\n\npublic interface I1<T> where T : I1<T>\n{\n abstract static void M1();\n abstract static int operator +(T x);\n abstract static int operator +(T x, T y);\n abstract static implicit operator int(T i);\n abstract static explicit operator T(int i);\n}\n\nclass C : I1<C>\n{\n [UnmanagedCallersOnly] static void I1<C>.M1() {}\n [UnmanagedCallersOnly] static int I1<C>.operator +(C x) => 0;\n [UnmanagedCallersOnly] static int I1<C>.operator +(C x, C y) => 0;\n [UnmanagedCallersOnly] static implicit I1<C>.operator int(C i) => 0;\n [UnmanagedCallersOnly] static explicit I1<C>.operator C(int i) => null;\n}\n\";\n\n var compilation2 = CreateCompilation(source2, options: TestOptions.DebugDll,\n parseOptions: TestOptions.RegularPreview,\n targetFramework: _supportingFramework);\n\n compilation2.VerifyDiagnostics(\n // (15,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] static void I1<C>.M1() {}\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(15, 6),\n // (16,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] static int I1<C>.operator +(C x) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(16, 6),\n // (17,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] static int I1<C>.operator +(C x, C y) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(17, 6),\n // (18,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] static implicit I1<C>.operator int(C i) => 0;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(18, 6),\n // (19,6): error CS8896: 'UnmanagedCallersOnly' can only be applied to ordinary static non-abstract methods or static local functions.\n // [UnmanagedCallersOnly] static explicit I1<C>.operator C(int i) => null;\n Diagnostic(ErrorCode.ERR_UnmanagedCallersOnlyRequiresStatic, \"UnmanagedCallersOnly\").WithLocation(19, 6)\n );\n }\n }\n}\n"},"label":{"kind":"number","value":1,"string":"1"}}},{"rowIdx":2699,"cells":{"repo_name":{"kind":"string","value":"dotnet/roslyn"},"pr_number":{"kind":"number","value":56173,"string":"56,173"},"pr_title":{"kind":"string","value":"Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property."},"pr_description":{"kind":"string","value":"Closes #53800.\r\nRelated to #56171."},"author":{"kind":"string","value":"AlekseyTs"},"date_created":{"kind":"timestamp","value":"2021-09-03T17:22:56Z","string":"2021-09-03T17:22:56Z"},"date_merged":{"kind":"timestamp","value":"2021-09-07T18:21:02Z","string":"2021-09-07T18:21:02Z"},"previous_commit":{"kind":"string","value":"ec20540d1ac3d0b048ddfb3b7831728511f3e3bb"},"pr_commit":{"kind":"string","value":"5851730e82f7805df3559444fd0f605243bd1adf"},"query":{"kind":"string","value":"Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.\r\nRelated to #56171."},"filepath":{"kind":"string","value":"./src/Compilers/Core/Portable/SpecialMember.cs"},"before_content":{"kind":"string","value":"// Licensed to the .NET Foundation under one or more agreements.\n// The .NET Foundation licenses this file to you under the MIT license.\n// See the LICENSE file in the project root for more information.\n\nnamespace Microsoft.CodeAnalysis\n{\n // members of special types\n internal enum SpecialMember\n {\n System_String__CtorSZArrayChar,\n\n System_String__ConcatStringString,\n System_String__ConcatStringStringString,\n System_String__ConcatStringStringStringString,\n System_String__ConcatStringArray,\n\n System_String__ConcatObject,\n System_String__ConcatObjectObject,\n System_String__ConcatObjectObjectObject,\n System_String__ConcatObjectArray,\n\n System_String__op_Equality,\n System_String__op_Inequality,\n System_String__Length,\n System_String__Chars,\n System_String__Format,\n System_String__Substring,\n\n System_Double__IsNaN,\n System_Single__IsNaN,\n\n System_Delegate__Combine,\n System_Delegate__Remove,\n System_Delegate__op_Equality,\n System_Delegate__op_Inequality,\n\n System_Decimal__Zero,\n System_Decimal__MinusOne,\n System_Decimal__One,\n System_Decimal__CtorInt32,\n System_Decimal__CtorUInt32,\n System_Decimal__CtorInt64,\n System_Decimal__CtorUInt64,\n System_Decimal__CtorSingle,\n System_Decimal__CtorDouble,\n System_Decimal__CtorInt32Int32Int32BooleanByte,\n\n System_Decimal__op_Addition,\n System_Decimal__op_Subtraction,\n System_Decimal__op_Multiply,\n System_Decimal__op_Division,\n System_Decimal__op_Modulus,\n System_Decimal__op_UnaryNegation,\n System_Decimal__op_Increment,\n System_Decimal__op_Decrement,\n\n System_Decimal__NegateDecimal,\n System_Decimal__RemainderDecimalDecimal,\n System_Decimal__AddDecimalDecimal,\n System_Decimal__SubtractDecimalDecimal,\n System_Decimal__MultiplyDecimalDecimal,\n System_Decimal__DivideDecimalDecimal,\n System_Decimal__ModuloDecimalDecimal,\n System_Decimal__CompareDecimalDecimal,\n\n System_Decimal__op_Equality,\n System_Decimal__op_Inequality,\n System_Decimal__op_GreaterThan,\n System_Decimal__op_GreaterThanOrEqual,\n System_Decimal__op_LessThan,\n System_Decimal__op_LessThanOrEqual,\n\n System_Decimal__op_Implicit_FromByte,\n System_Decimal__op_Implicit_FromChar,\n System_Decimal__op_Implicit_FromInt16,\n System_Decimal__op_Implicit_FromInt32,\n System_Decimal__op_Implicit_FromInt64,\n System_Decimal__op_Implicit_FromSByte,\n System_Decimal__op_Implicit_FromUInt16,\n System_Decimal__op_Implicit_FromUInt32,\n System_Decimal__op_Implicit_FromUInt64,\n\n System_Decimal__op_Explicit_ToByte,\n System_Decimal__op_Explicit_ToUInt16,\n System_Decimal__op_Explicit_ToSByte,\n System_Decimal__op_Explicit_ToInt16,\n System_Decimal__op_Explicit_ToSingle,\n System_Decimal__op_Explicit_ToDouble,\n System_Decimal__op_Explicit_ToChar,\n System_Decimal__op_Explicit_ToUInt64,\n System_Decimal__op_Explicit_ToInt32,\n System_Decimal__op_Explicit_ToUInt32,\n System_Decimal__op_Explicit_ToInt64,\n System_Decimal__op_Explicit_FromDouble,\n System_Decimal__op_Explicit_FromSingle,\n\n System_DateTime__MinValue,\n System_DateTime__CtorInt64,\n System_DateTime__CompareDateTimeDateTime,\n\n System_DateTime__op_Equality,\n System_DateTime__op_Inequality,\n System_DateTime__op_GreaterThan,\n System_DateTime__op_GreaterThanOrEqual,\n System_DateTime__op_LessThan,\n System_DateTime__op_LessThanOrEqual,\n\n System_Collections_IEnumerable__GetEnumerator,\n System_Collections_IEnumerator__Current,\n System_Collections_IEnumerator__get_Current,\n System_Collections_IEnumerator__MoveNext,\n System_Collections_IEnumerator__Reset,\n\n System_Collections_Generic_IEnumerable_T__GetEnumerator,\n System_Collections_Generic_IEnumerator_T__Current,\n System_Collections_Generic_IEnumerator_T__get_Current,\n\n System_IDisposable__Dispose,\n\n System_Array__Length,\n System_Array__LongLength,\n System_Array__GetLowerBound,\n System_Array__GetUpperBound,\n\n System_Object__GetHashCode,\n System_Object__Equals,\n System_Object__EqualsObjectObject,\n System_Object__ToString,\n System_Object__ReferenceEquals,\n\n System_IntPtr__op_Explicit_ToPointer,\n System_IntPtr__op_Explicit_ToInt32,\n System_IntPtr__op_Explicit_ToInt64,\n System_IntPtr__op_Explicit_FromPointer,\n System_IntPtr__op_Explicit_FromInt32,\n System_IntPtr__op_Explicit_FromInt64,\n System_UIntPtr__op_Explicit_ToPointer,\n System_UIntPtr__op_Explicit_ToUInt32,\n System_UIntPtr__op_Explicit_ToUInt64,\n System_UIntPtr__op_Explicit_FromPointer,\n System_UIntPtr__op_Explicit_FromUInt32,\n System_UIntPtr__op_Explicit_FromUInt64,\n\n System_Nullable_T_GetValueOrDefault,\n System_Nullable_T_get_Value,\n System_Nullable_T_get_HasValue,\n System_Nullable_T__ctor,\n System_Nullable_T__op_Implicit_FromT,\n System_Nullable_T__op_Explicit_ToT,\n\n System_Runtime_CompilerServices_RuntimeFeature__DefaultImplementationsOfInterfaces,\n System_Runtime_CompilerServices_RuntimeFeature__UnmanagedSignatureCallingConvention,\n System_Runtime_CompilerServices_RuntimeFeature__CovariantReturnsOfClasses,\n\n System_Runtime_CompilerServices_PreserveBaseOverridesAttribute__ctor,\n\n Count\n }\n}\n"},"after_content":{"kind":"string","value":"// Licensed to the .NET Foundation under one or more agreements.\n// The .NET Foundation licenses this file to you under the MIT license.\n// See the LICENSE file in the project root for more information.\n\nnamespace Microsoft.CodeAnalysis\n{\n // members of special types\n internal enum SpecialMember\n {\n System_String__CtorSZArrayChar,\n\n System_String__ConcatStringString,\n System_String__ConcatStringStringString,\n System_String__ConcatStringStringStringString,\n System_String__ConcatStringArray,\n\n System_String__ConcatObject,\n System_String__ConcatObjectObject,\n System_String__ConcatObjectObjectObject,\n System_String__ConcatObjectArray,\n\n System_String__op_Equality,\n System_String__op_Inequality,\n System_String__Length,\n System_String__Chars,\n System_String__Format,\n System_String__Substring,\n\n System_Double__IsNaN,\n System_Single__IsNaN,\n\n System_Delegate__Combine,\n System_Delegate__Remove,\n System_Delegate__op_Equality,\n System_Delegate__op_Inequality,\n\n System_Decimal__Zero,\n System_Decimal__MinusOne,\n System_Decimal__One,\n System_Decimal__CtorInt32,\n System_Decimal__CtorUInt32,\n System_Decimal__CtorInt64,\n System_Decimal__CtorUInt64,\n System_Decimal__CtorSingle,\n System_Decimal__CtorDouble,\n System_Decimal__CtorInt32Int32Int32BooleanByte,\n\n System_Decimal__op_Addition,\n System_Decimal__op_Subtraction,\n System_Decimal__op_Multiply,\n System_Decimal__op_Division,\n System_Decimal__op_Modulus,\n System_Decimal__op_UnaryNegation,\n System_Decimal__op_Increment,\n System_Decimal__op_Decrement,\n\n System_Decimal__NegateDecimal,\n System_Decimal__RemainderDecimalDecimal,\n System_Decimal__AddDecimalDecimal,\n System_Decimal__SubtractDecimalDecimal,\n System_Decimal__MultiplyDecimalDecimal,\n System_Decimal__DivideDecimalDecimal,\n System_Decimal__ModuloDecimalDecimal,\n System_Decimal__CompareDecimalDecimal,\n\n System_Decimal__op_Equality,\n System_Decimal__op_Inequality,\n System_Decimal__op_GreaterThan,\n System_Decimal__op_GreaterThanOrEqual,\n System_Decimal__op_LessThan,\n System_Decimal__op_LessThanOrEqual,\n\n System_Decimal__op_Implicit_FromByte,\n System_Decimal__op_Implicit_FromChar,\n System_Decimal__op_Implicit_FromInt16,\n System_Decimal__op_Implicit_FromInt32,\n System_Decimal__op_Implicit_FromInt64,\n System_Decimal__op_Implicit_FromSByte,\n System_Decimal__op_Implicit_FromUInt16,\n System_Decimal__op_Implicit_FromUInt32,\n System_Decimal__op_Implicit_FromUInt64,\n\n System_Decimal__op_Explicit_ToByte,\n System_Decimal__op_Explicit_ToUInt16,\n System_Decimal__op_Explicit_ToSByte,\n System_Decimal__op_Explicit_ToInt16,\n System_Decimal__op_Explicit_ToSingle,\n System_Decimal__op_Explicit_ToDouble,\n System_Decimal__op_Explicit_ToChar,\n System_Decimal__op_Explicit_ToUInt64,\n System_Decimal__op_Explicit_ToInt32,\n System_Decimal__op_Explicit_ToUInt32,\n System_Decimal__op_Explicit_ToInt64,\n System_Decimal__op_Explicit_FromDouble,\n System_Decimal__op_Explicit_FromSingle,\n\n System_DateTime__MinValue,\n System_DateTime__CtorInt64,\n System_DateTime__CompareDateTimeDateTime,\n\n System_DateTime__op_Equality,\n System_DateTime__op_Inequality,\n System_DateTime__op_GreaterThan,\n System_DateTime__op_GreaterThanOrEqual,\n System_DateTime__op_LessThan,\n System_DateTime__op_LessThanOrEqual,\n\n System_Collections_IEnumerable__GetEnumerator,\n System_Collections_IEnumerator__Current,\n System_Collections_IEnumerator__get_Current,\n System_Collections_IEnumerator__MoveNext,\n System_Collections_IEnumerator__Reset,\n\n System_Collections_Generic_IEnumerable_T__GetEnumerator,\n System_Collections_Generic_IEnumerator_T__Current,\n System_Collections_Generic_IEnumerator_T__get_Current,\n\n System_IDisposable__Dispose,\n\n System_Array__Length,\n System_Array__LongLength,\n System_Array__GetLowerBound,\n System_Array__GetUpperBound,\n\n System_Object__GetHashCode,\n System_Object__Equals,\n System_Object__EqualsObjectObject,\n System_Object__ToString,\n System_Object__ReferenceEquals,\n\n System_IntPtr__op_Explicit_ToPointer,\n System_IntPtr__op_Explicit_ToInt32,\n System_IntPtr__op_Explicit_ToInt64,\n System_IntPtr__op_Explicit_FromPointer,\n System_IntPtr__op_Explicit_FromInt32,\n System_IntPtr__op_Explicit_FromInt64,\n System_UIntPtr__op_Explicit_ToPointer,\n System_UIntPtr__op_Explicit_ToUInt32,\n System_UIntPtr__op_Explicit_ToUInt64,\n System_UIntPtr__op_Explicit_FromPointer,\n System_UIntPtr__op_Explicit_FromUInt32,\n System_UIntPtr__op_Explicit_FromUInt64,\n\n System_Nullable_T_GetValueOrDefault,\n System_Nullable_T_get_Value,\n System_Nullable_T_get_HasValue,\n System_Nullable_T__ctor,\n System_Nullable_T__op_Implicit_FromT,\n System_Nullable_T__op_Explicit_ToT,\n\n System_Runtime_CompilerServices_RuntimeFeature__DefaultImplementationsOfInterfaces,\n System_Runtime_CompilerServices_RuntimeFeature__UnmanagedSignatureCallingConvention,\n System_Runtime_CompilerServices_RuntimeFeature__CovariantReturnsOfClasses,\n System_Runtime_CompilerServices_RuntimeFeature__VirtualStaticsInInterfaces,\n\n System_Runtime_CompilerServices_PreserveBaseOverridesAttribute__ctor,\n\n Count\n }\n}\n"},"label":{"kind":"number","value":1,"string":"1"}}}],"truncated":false,"partial":false},"paginationData":{"pageIndex":26,"numItemsPerPage":100,"numTotalItems":2074433,"offset":2600,"length":100}},"jwt":"eyJhbGciOiJFZERTQSJ9.eyJyZWFkIjp0cnVlLCJwZXJtaXNzaW9ucyI6eyJyZXBvLmNvbnRlbnQucmVhZCI6dHJ1ZX0sImlhdCI6MTc3NTc4OTIyNywic3ViIjoiL2RhdGFzZXRzL3N1c25hdG8vY3NoYXJwX1BScyIsImV4cCI6MTc3NTc5MjgyNywiaXNzIjoiaHR0cHM6Ly9odWdnaW5nZmFjZS5jbyJ9.h_WY6rT-wGX3ObLizj5JW8HVqiQCtC4FsqXGDkBGS8SzHfuqrFq6RW09FIOUxymMZCeBGcwMYqJlKXItrlOlAw","displayUrls":true,"splitSizeSummaries":[{"config":"default","split":"train","numRows":2074433,"numBytesParquet":58125931847}]},"discussionsStats":{"closed":0,"open":1,"total":1},"fullWidth":true,"hasGatedAccess":true,"hasFullAccess":true,"isEmbedded":false,"savedQueries":{"community":[],"user":[]}}">
repo_name stringclasses 6
values | pr_number int64 512 78.9k | pr_title stringlengths 3 144 | pr_description stringlengths 0 30.3k | author stringlengths 2 21 | date_created timestamp[ns, tz=UTC] | date_merged timestamp[ns, tz=UTC] | previous_commit stringlengths 40 40 | pr_commit stringlengths 40 40 | query stringlengths 17 30.4k | filepath stringlengths 9 210 | before_content stringlengths 0 112M | after_content stringlengths 0 112M | label int64 -1 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/Core/CodeAnalysisTest/Collections/List/IList.Generic.Tests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// NOTE: This code is derived from an implementation originally in dotnet/runtime:
// https://github.com/dotnet/run... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// NOTE: This code is derived from an implementation originally in dotnet/runtime:
// https://github.com/dotnet/run... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/VisualStudio/Core/Def/Implementation/Preview/ChangeList.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using Microsoft.VisualStudio.Shell.Interop;
namespace Microsoft.VisualStudio.Lang... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using Microsoft.VisualStudio.Shell.Interop;
namespace Microsoft.VisualStudio.Lang... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Workspaces/CSharpTest/Formatting/FormattingTreeEditTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Syntax;
usi... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Syntax;
usi... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/Core/Portable/Emit/DebugDocumentsBuilder.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Roslyn.Utilities;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
names... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Roslyn.Utilities;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
names... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Analyzers/CSharp/Tests/UseCollectionInitializer/UseCollectionInitializerTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalys... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalys... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/EditorFeatures/CSharpTest2/Recommendations/DefineKeywordRecommenderTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/EditorFeatures/CSharpTest2/Recommendations/OrderByKeywordRecommenderTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Workspaces/MSBuildTest/Resources/NuGet.Config | <?xml version="1.0" encoding="utf-8"?>
<configuration>
<!-- Provide a default package restore source for test projects. -->
<packageRestore>
<add key="enabled" value="true" />
</packageRestore>
<packageSources>
<clear />
<add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" protocolV... | <?xml version="1.0" encoding="utf-8"?>
<configuration>
<!-- Provide a default package restore source for test projects. -->
<packageRestore>
<add key="enabled" value="true" />
</packageRestore>
<packageSources>
<clear />
<add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" protocolV... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Workspaces/CoreTest/SolutionTests/ProjectInfoTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalysi... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalysi... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Workspaces/Core/Portable/Simplification/AbstractReducer.IExpressionRewriter.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Threading;
using Microsoft.CodeAnalysis.Options;
namespace Microsoft... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Threading;
using Microsoft.CodeAnalysis.Options;
namespace Microsoft... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/Core/Portable/Operations/CaptureId.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis.FlowAnalysis
{
/// <summary>
/// ... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis.FlowAnalysis
{
/// <summary>
/// ... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/EditorFeatures/CSharpTest2/Recommendations/HiddenKeywordRecommenderTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
namespa... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/Core/Portable/SourceGeneration/Nodes/CombineNode.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Thread... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Thread... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/EditorFeatures/Test2/PasteTracking/PasteTrackingServiceTests.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Namespace Microsoft.CodeAnalysis.PasteTracking
<UseExportProvider>
Public Class PasteTrackingServiceTests
... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Namespace Microsoft.CodeAnalysis.PasteTracking
<UseExportProvider>
Public Class PasteTrackingServiceTests
... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Features/CSharp/Portable/ReverseForStatement/CSharpReverseForStatementCodeRefactoringProvider.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Features/VisualBasic/Portable/ExtractMethod/VisualBasicExtractMethodService.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Composition
Imports Microsoft.CodeAnalysis.ExtractMethod
Imports Microsoft.CodeAnalysis.Host.Mef
Import... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Composition
Imports Microsoft.CodeAnalysis.ExtractMethod
Imports Microsoft.CodeAnalysis.Host.Mef
Import... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenAsyncSpillTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/VisualBasic/vbc/App.config | <?xml version="1.0" encoding="utf-8" ?>
<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETF... | <?xml version="1.0" encoding="utf-8" ?>
<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETF... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Analyzers/Core/Analyzers/PopulateSwitch/AbstractPopulateSwitchDiagnosticAnalyzer.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.Cod... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.Cod... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./docs/features/nullable-reference-types.md | Nullable Reference Types
=========
Reference types may be nullable, non-nullable, or null-oblivious (abbreviated here as `?`, `!`, and `~`).
## Setting project level nullable context
Project level nullable context can be set by using "nullable" command line switch:
-nullable[+|-] Specify nullab... | Nullable Reference Types
=========
Reference types may be nullable, non-nullable, or null-oblivious (abbreviated here as `?`, `!`, and `~`).
## Setting project level nullable context
Project level nullable context can be set by using "nullable" command line switch:
-nullable[+|-] Specify nullab... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/EditorFeatures/Test2/Rename/RenameEngineResult.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces
Imp... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces
Imp... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Features/Lsif/GeneratorTest/HoverTests.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces
Imports Microsoft.CodeAnalysis.Test.Utilities
Imports Micro... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspaces
Imports Microsoft.CodeAnalysis.Test.Utilities
Imports Micro... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Tools/BuildBoss/ProjectType.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Syst... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Syst... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_WhileStatement.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Workspaces/VisualBasic/Portable/CodeGeneration/ConstructorGenerator.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.CodeGeneration
Imports Microsoft.CodeAnalysis.CodeGeneration.CodeGenerationHelpers
Impo... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.CodeGeneration
Imports Microsoft.CodeAnalysis.CodeGeneration.CodeGenerationHelpers
Impo... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/Core/Portable/FileSystem/RelativePathResolver.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
#pragma warning disable 436 // The type 'RelativePathResolver' conflicts with imported type
usi... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
#pragma warning disable 436 // The type 'RelativePathResolver' conflicts with imported type
usi... | -1 |
dotnet/roslyn | 56,187 | Add External Access options for TypeScript | Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | tmat | 2021-09-03T22:11:29Z | 2021-09-07T17:42:47Z | 4fada24142fb5bfdf4ec530e56eebf712227cbc9 | 409fcc26226c782f306d81cdbeed06d86b2de3f4 | Add External Access options for TypeScript. Used in https://devdiv.visualstudio.com/DevDiv/_git/TypeScript-VS/pullrequest/349183 | ./src/Compilers/VisualBasic/Test/Semantic/Semantics/Lambda_Relaxation.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Test.Utilities
Imports Microsoft.CodeAnalysis.VisualBasic
Imports Microsoft.CodeAnalysi... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Test.Utilities
Imports Microsoft.CodeAnalysis.VisualBasic
Imports Microsoft.CodeAnalysi... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Test/Semantic/SourceGeneration/StateTableTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Threading;
using M... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Threading;
using M... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/DiagnosticAnalyzer/DefaultAnalyzerAssemblyLoader.Core.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#if NETCOREAPP
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.I... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#if NETCOREAPP
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.I... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/SourceGeneration/GeneratorDriver.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Globalization;
using Syste... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Globalization;
using Syste... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/SourceGeneration/GeneratorDriverState.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.Diagnostics;
namespace ... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.Diagnostic... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/SourceGeneration/GeneratorState.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis
{
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis
{
... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/SourceGeneration/RunResults.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using System.Threadi... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using System.Threadi... | 1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Server/VBCSCompiler/NamedPipeClientConnection.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Roslyn.Utilities;
using System;
using System.Diagnostics;
using System.IO;
using System.IO.Pipes;
using Syste... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Roslyn.Utilities;
using System;
using System.Diagnostics;
using System.IO;
using System.IO.Pipes;
using Syste... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/SharedUtilitiesAndExtensions/Workspace/CSharp/LanguageServices/CSharpSemanticFactsServiceFactory.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Composition;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeA... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Composition;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeA... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/FlowAnalysis/AbstractRegionControlFlowPass.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.CSharp.Symbols;
namespace Micr... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.CSharp.Symbols;
namespace Micr... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/TestUtilities/Async/Checkpoint.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Syst... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Syst... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/CSharp/Portable/CodeFixes/RemoveNewModifier/RemoveNewModifierCodeFixProvider.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnos... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnos... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/Navigation/IDocumentNavigationService.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using M... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using M... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Def/Implementation/ProjectSystem/MetadataReferences/VisualStudioMetadataReferenceProviderServiceFactory.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Composition;
using System.Diagnostics;
using Microsoft.CodeAnalysis;
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Composition;
using System.Diagnostics;
using Microsoft.CodeAnalysis;
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/Portable/CodeFixes/FixAllOccurrences/BatchFixAllProvider.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/Portable/SymbolKey/SymbolKeyExtensions.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Threading;
namespace Microsoft.CodeAnalysis
{
internal static class SymbolKeyExtensions
{
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Threading;
namespace Microsoft.CodeAnalysis
{
internal static class SymbolKeyExtensions
{
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Test/Utilities/CSharp/MockCSharpCompiler.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Remote/Core/ExternalAccess/Pythia/Api/PythiaRemoteHostClient.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Micros... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Micros... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/EmbeddedLanguages/RegularExpressions/RegexEmbeddedLanguage.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Classificatio... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Classificatio... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/EditAndContinue/DebuggingSessionTelemetry.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
namespace Microsoft.CodeAnalysis.EditAndCont... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
namespace Microsoft.CodeAnalysis.EditAndCont... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/TestUtilities/EditAndContinue/DeclaratorMapDescription.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using S... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using S... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/Formatting/TriviaEngine/TriviaList.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.CodeAnalysis.Formatting
{
internal readonly struct TriviaList
{
private readonl... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.CodeAnalysis.Formatting
{
internal readonly struct TriviaList
{
private readonl... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Impl/CodeModel/InternalElements/CodeImplementsStatement.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/CSharpTest/NavigateTo/NavigateToSearcherTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using System.Threading... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using System.Threading... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/CSharpTest/ConflictMarkerResolution/ConflictMarkerResolutionTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ConflictMarkerResolution;
using Micro... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ConflictMarkerResolution;
using Micro... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/PEWriter/MetadataWriter.DynamicAnalysis.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/Test/AssemblyReferenceTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using Roslyn.Test.Utilities;
using Xunit;
namespace Microsoft.CodeAnalysis.E... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using Roslyn.Test.Utilities;
using Xunit;
namespace Microsoft.CodeAnalysis.E... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/ExpressionEvaluator/CSharp/Source/ExpressionCompiler/Symbols/EEDisplayClassFieldLocalSymbol.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Microsoft.CodeAnalysis.CSharp.Symbols;
using System.Collections.Immutable;
using System.Di... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Microsoft.CodeAnalysis.CSharp.Symbols;
using System.Collections.Immutable;
using System.Di... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/Syntax/CrefParameterSyntax.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.ComponentModel;
namespace Microsoft.CodeAnalysis.CSharp.Syntax
{
public sealed partial class Cref... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.ComponentModel;
namespace Microsoft.CodeAnalysis.CSharp.Syntax
{
public sealed partial class Cref... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/Core/Implementation/Structure/StructureTag.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Microsoft.CodeAnalysis.Structure;
using Microsoft.CodeAnalysis.Text.Shared.Extensions;
using Microsoft.Visual... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Microsoft.CodeAnalysis.Structure;
using Microsoft.CodeAnalysis.Text.Shared.Extensions;
using Microsoft.Visual... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/Lowering/Extensions.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CShar... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CShar... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/RQName/RQNodeBuilder.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalys... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalys... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/CSharpTest/ChangeSignature/AddParameterTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ChangeSignature;
using Microsoft.Code... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ChangeSignature;
using Microsoft.Code... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/CSharp/Portable/Completion/KeywordRecommenders/ChecksumKeywordRecommender.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
namespace ... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
namespace ... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Test/Syntax/Syntax/SyntaxNodeTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Lsif/Generator/Graph/Capabilities.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Newtonsoft.Json;
namespace Microsoft.CodeAnalysis.LanguageServerIndexFormat.Generator.Graph
{
/// <summa... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Newtonsoft.Json;
namespace Microsoft.CodeAnalysis.LanguageServerIndexFormat.Generator.Graph
{
/// <summa... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/Portable/Workspace/Host/PersistentStorage/DocumentKey.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Runtime.Serialization;
using Microsoft.CodeAnalysis.Host;
namespace... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Runtime.Serialization;
using Microsoft.CodeAnalysis.Host;
namespace... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/CSharp/Impl/CodeModel/ParameterFlags.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
namespace Microsoft.VisualStudio.LanguageServices.CSharp.CodeModel
{
[Flags]
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
namespace Microsoft.VisualStudio.LanguageServices.CSharp.CodeModel
{
[Flags]
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Test/Symbol/Symbols/Source/MethodTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/CSharp/Impl/LanguageService/CSharpEditorFactory.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_AnonymousObjectCreation.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Mi... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Mi... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Def/Implementation/Experimentation/KeybindingResetDetector.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.Ru... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.Ru... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/Symbols/SymbolDistinguisher.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Roslyn.Utilities;
using System;
using System.... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Roslyn.Utilities;
using System;
using System.... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Portable/Declarations/DeclarationModifiers.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
namespace Microsoft.CodeAnalysis.CSharp
{
[Flags]
internal enum DeclarationModifiers : uint
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
namespace Microsoft.CodeAnalysis.CSharp
{
[Flags]
internal enum DeclarationModifiers : uint
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/CSharp/Portable/CodeFixes/HideBase/HideBaseCodeFixProvider.AddNewKeywordAction.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading.Tasks;
using System.Threading;
using Microsoft.CodeAna... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading.Tasks;
using System.Threading;
using Microsoft.CodeAna... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Tools/BuildBoss/SolutionCheckerUtil.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace B... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace B... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/MSBuild/MSBuild/ProjectFile/Conversions.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
namespace Microsoft.CodeAnalysis.MSBuild
{
/// <summary>
/// Handles conversions from MSBuil... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
namespace Microsoft.CodeAnalysis.MSBuild
{
/// <summary>
/// Handles conversions from MSBuil... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/VisualBasicTest/EncapsulateField/EncapsulateFieldTestState.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.Shared
Imports Microsoft.CodeAnalysis.Editor.[Shared].Utilities
Imports Microsof... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.Shared
Imports Microsoft.CodeAnalysis.Editor.[Shared].Utilities
Imports Microsof... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/MSBuildTest/Resources/SolutionFiles/CSharp_UnknownProjectTypeGuid.sln |
Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
Project("{FAE04EC0-301F-11D3-BF4B-000000000000}") = "CSharpProject", "CSharpProject\CSharpProject.csproj", "{686DD036-86AA-443E-8A10-DDB43266A8C4}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|An... |
Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
Project("{FAE04EC0-301F-11D3-BF4B-000000000000}") = "CSharpProject", "CSharpProject\CSharpProject.csproj", "{686DD036-86AA-443E-8A10-DDB43266A8C4}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|An... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/CoreTestUtilities/Fakes/SimpleAssetSource.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Threading;
usin... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Threading;
usin... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Impl/CodeModel/Collections/ExternalParameterCollection.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using System.Runtime.InteropServices;
using Microsoft.CodeAn... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Immutable;
using System.Runtime.InteropServices;
using Microsoft.CodeAn... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/SharedUtilitiesAndExtensions/Workspace/Core/xlf/WorkspaceExtensionsResources.de.xlf | <?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" target-language="de" or... | <?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" target-language="de" or... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/EditAndContinue/BidirectionalMap.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Generic;
using Microsoft.CodeAnalysis.Differencing;
namespace Microsof... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Collections.Generic;
using Microsoft.CodeAnalysis.Differencing;
namespace Microsof... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/VisualBasicTest/BraceMatching/VisualBasicBraceMatcherTests.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.UnitTests.BraceMatching
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspac... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.Editor.UnitTests.BraceMatching
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Workspac... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/Test2/InlineHints/CSharpInlineParameterNameHintsTests.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Namespace Microsoft.CodeAnalysis.Editor.UnitTests.InlineHints
Public Class CSharpInlineParameterNameHintsTests
... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Namespace Microsoft.CodeAnalysis.Editor.UnitTests.InlineHints
Public Class CSharpInlineParameterNameHintsTests
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/Core/Portable/DiaSymReader/Writer/ISymUnmanagedWriter.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
#pragma warning disable 436 // SuppressUnmanagedCodeSecurityAttribute defined in source and msco... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
#pragma warning disable 436 // SuppressUnmanagedCodeSecurityAttribute defined in source and msco... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/Core/Portable/GenerateMember/GenerateParameterizedMember/AbstractGenerateParameterizedMemberService.State.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAna... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAna... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/VisualBasicTest/ChangeSignature/AddParameterTests.Formatting.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.ChangeSignature
Imports Microsoft.CodeAnalysis.Editor.UnitTests.ChangeSignature
Imports... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports Microsoft.CodeAnalysis.ChangeSignature
Imports Microsoft.CodeAnalysis.Editor.UnitTests.ChangeSignature
Imports... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/EditorFeatures/CSharpTest/AddUsing/AddUsingTests_Razor.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Remote.Testing;
using... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Remote.Testing;
using... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/VisualBasic/Portable/Completion/KeywordRecommenders/Declarations/IteratorKeywordRecommender.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Collections.Immutable
Imports System.Threading
Imports Microsoft.CodeAnalysis.Completion.Providers
Impo... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
Imports System.Collections.Immutable
Imports System.Threading
Imports Microsoft.CodeAnalysis.Completion.Providers
Impo... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Features/LanguageServer/ProtocolUnitTests/Highlights/DocumentHighlightTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Ros... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Ros... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/Portable/ExternalAccess/UnitTesting/Api/IUnitTestingIncrementalAnalyzerProviderImplementation.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
{
internal interface IUnitTe... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
{
internal interface IUnitTe... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Compilers/CSharp/Test/Syntax/Parsing/RefReadonlyTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Xunit;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Micros... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using Xunit;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Micros... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Workspaces/Core/Portable/SymbolKey/SymbolKey.NamespaceSymbolKey.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis
{
internal partial struct SymbolKey
... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis
{
internal partial struct SymbolKey
... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Impl/CodeModel/Collections/ParameterCollection.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/Tools/Source/CompilerGeneratorTools/Source/VisualBasicSyntaxGenerator/GreenNodes/GreenNodeWriter.vb | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
'-----------------------------------------------------------------------------------------------------------
' This is... | ' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
'-----------------------------------------------------------------------------------------------------------
' This is... | -1 |
dotnet/roslyn | 56,178 | Merge release/dev17.0 to main |
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to the bottom, then for each file c... | dotnet-bot | 2021-09-03T21:01:12Z | 2021-09-03T22:10:51Z | 28d4d9d9869cf2b37e3e700e1057adf367fe9cd0 | 9e0b1adf36ff313a8e5374b401352b927ef3fb59 | Merge release/dev17.0 to main.
This is an automatically generated pull request from release/dev17.0 into main.
Once all conflicts are resolved and all the tests pass, you are free to merge the pull request. 🐯
## Troubleshooting conflicts
### Identify authors of changes which introduced merge conflicts
Scroll to t... | ./src/VisualStudio/Core/Def/EditorConfigSettings/CodeStyle/ViewModel/CodeStyleSettingsViewModel.SettingsEntriesSnapshot.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Editor.EditorConfigSettings;
using Microsoft.CodeA... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Editor.EditorConfigSettings;
using Microsoft.CodeA... | -1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./eng/Versions.props | <?xml version="1.0" encoding="utf-8"?>
<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
<Project>
<!--
Roslyn version
-->
<PropertyGroup>
<MajorVersion>... | <?xml version="1.0" encoding="utf-8"?>
<!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information. -->
<Project>
<!--
Roslyn version
-->
<PropertyGroup>
<MajorVersion>... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/CSharp/Portable/Symbols/AssemblySymbol.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/CSharp/Test/Emit/Attributes/AttributeTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/CSharp/Test/Symbol/Symbols/DefaultInterfaceImplementationTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
u... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
u... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/CSharp/Test/Symbol/Symbols/MissingSpecialMember.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Micro... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Micro... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/CSharp/Test/Symbol/Symbols/StaticAbstractMembersInInterfacesTests.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
u... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
u... | 1 |
dotnet/roslyn | 56,173 | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property. | Closes #53800.
Related to #56171. | AlekseyTs | 2021-09-03T17:22:56Z | 2021-09-07T18:21:02Z | ec20540d1ac3d0b048ddfb3b7831728511f3e3bb | 5851730e82f7805df3559444fd0f605243bd1adf | Provide real implementation for RuntimeSupportsStaticAbstractMembersInInterfaces property.. Closes #53800.
Related to #56171. | ./src/Compilers/Core/Portable/SpecialMember.cs | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.CodeAnalysis
{
// members of special types
internal enum SpecialMember
{
Sy... | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace Microsoft.CodeAnalysis
{
// members of special types
internal enum SpecialMember
{
Sy... | 1 |