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Lean4-Changelog

version stringclasses 29 values	section stringclasses 29 values	text stringlengths 5 950	date stringdate 2023-09-08 00:00:00 2025-04-03 00:00:00	change_type stringclasses 2 values	is_breaking stringclasses 2 values	pr_number stringlengths 0 4	files_changed listlengths 0 60	source_url stringclasses 1 value
v4.19.0-rc2	Language	#5182 makes functions defined by well-founded recursion use an	2025-04-03	Changed	False	5182	[ "src/Init/Core.lean", "src/Init/Data/Array/Attach.lean", "src/Init/Data/Array/Erase.lean", "src/Init/Data/Array/Find.lean", "src/Init/Data/Array/Lemmas.lean", "src/Init/Data/Array/OfFn.lean", "src/Init/Data/Array/Range.lean", "src/Init/Data/Fin/Fold.lean", "src/Init/Data/Vector/Attach.lean", "src/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#5998 lets `omega` always abstract its own proofs into an auxiliary	2025-04-03	Changed	False	5998	[ "src/Lean/Data/Name.lean", "src/Lean/Elab/Tactic/Omega/Frontend.lean", "src/Lean/Elab/Term.lean", "tests/lean/run/auxinvariable.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#6325 ensures that environments can be loaded, repeatedly, without	2025-04-03	Changed	False	6325	[ "releases_drafts/environment.md", "src/Lean/Elab/Import.lean", "src/Lean/Environment.lean", "src/lake/Lake/Load/Lean/Elab.lean", "tests/lean/ctor_layout.lean", "tests/lean/run/instances.lean", "tests/lean/run/instuniv.lean", "tests/lean/run/meta1.lean", "tests/lean/run/meta3.lean", "tests/pkg/user...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7075 ensures that names suggested by tactics like `simp?` are not	2025-04-03	Changed	False	7075	[ "src/Lean/Elab/App.lean", "src/Lean/Elab/MutualInductive.lean", "src/Lean/Elab/Term.lean", "src/Lean/LocalContext.lean", "src/Lean/Meta/Basic.lean", "src/Lean/MetavarContext.lean", "src/Lean/ResolveName.lean", "tests/lean/run/6706.lean", "tests/lean/run/7073.lean", "tests/lean/run/998.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7084 enables the elaboration of theorem bodies, i.e. proofs, to	2025-04-03	Changed	False	7084	[ "src/Lean/Elab/Command.lean", "src/Lean/Elab/MutualDef.lean", "src/Lean/Elab/PreDefinition/Main.lean", "src/Lean/Elab/Tactic/AsAuxLemma.lean", "src/Lean/Meta/CongrTheorems.lean", "src/Lean/Meta/Eqns.lean", "src/Lean/Meta/Match/MatchEqs.lean", "src/Lean/MonadEnv.lean", "src/Lean/ReservedNameAction.le...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7166 extends the notion of “fixed parameter” of a recursive function	2025-04-03	Changed	False	7166	[ "src/Lean/Elab/PreDefinition/FixedParams.lean", "src/Lean/Elab/PreDefinition/Mutual.lean", "src/Lean/Elab/PreDefinition/PartialFixpoint/Eqns.lean", "src/Lean/Elab/PreDefinition/PartialFixpoint/Induction.lean", "src/Lean/Elab/PreDefinition/PartialFixpoint/Main.lean", "src/Lean/Elab/PreDefinition/Structural...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7247 makes generation of `match` equations and splitters compatible	2025-04-03	Changed	False	7247	[ "src/Lean/Attributes.lean", "src/Lean/Environment.lean", "src/Lean/Meta/Basic.lean", "src/Lean/Meta/Match/MatchEqs.lean", "src/Lean/Meta/Match/MatchEqsExt.lean", "src/Lean/Modifiers.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7256 introduces the `assert!` variant `debug_assert!` that is	2025-04-03	Changed	False	7256	[ "src/Lean/Elab/BuiltinNotation.lean", "src/Lean/Elab/Do.lean", "src/Lean/Parser/Do.lean", "src/Lean/Parser/Term.lean", "src/lake/Lake/Config/LeanConfig.lean", "src/lake/Lake/Config/LeanLib.lean", "tests/lean/1021.lean.expected.out", "tests/pkg/debug/Main.lean", "tests/pkg/debug/lakefile.toml", "te...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7261 ensures all equation, unfold, induction, and partial fixpoint	2025-04-03	Changed	False	7261	[ "src/Lean.lean", "src/Lean/AddDecl.lean", "src/Lean/Elab/PreDefinition/Mutual.lean", "src/Lean/Elab/PreDefinition/PartialFixpoint/Induction.lean", "src/Lean/Elab/PreDefinition/WF/Main.lean", "src/Lean/Environment.lean", "src/Lean/Meta/Basic.lean", "src/Lean/Meta/CongrTheorems.lean", "src/Lean/Meta/T...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7298 adds rewrites to bv_decide's preprocessing that concern	2025-04-03	Changed	False	7298	[ "src/Init/Data/BitVec/Lemmas.lean", "src/Std/Tactic/BVDecide/Normalize/Bool.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7302 changes how fields are elaborated in the `structure`/`class`	2025-04-03	Changed	False	7302	[ "src/Lean/Elab/StructInst.lean", "src/Lean/Elab/Structure.lean", "src/Lean/PrettyPrinter/Delaborator/Builtins.lean", "src/Lean/Structure.lean", "tests/lean/diamond1.lean.expected.out", "tests/lean/mvarAtDefaultValue.lean.expected.out", "tests/lean/run/delabStructInst.lean", "tests/lean/run/inductive_u...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	The entire collection of parents is processed, and all parent	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	For classes, every parent now contributes an instance, not just the	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	Default values are now processed according to the parent resolution	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	Default value omission for structure instance notation pretty printing	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	Now the elaborator generates a `_flat_ctor` constructor that will be	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	While elaborating fields, any metavariables whose type is one of the	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7304 fixes an issue where nested `let rec` declarations within	2025-04-03	Changed	False	7304	[ "src/Lean/Elab/MutualDef.lean", "tests/lean/run/6927.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7309 fixes a bug where bv_decide's new structure support would	2025-04-03	Changed	False	7309	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Structures.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/TypeAnalysis.lean", "tests/bv_relation.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7312 implements proof term generation for `cooper_dvd_left` and its	2025-04-03	Changed	False	7312	[ "src/Init/Data/Int/Linear.lean", "src/Init/Grind/Tactics.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Cooper.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7314 changes elaboration of `structure` parents so that each must be	2025-04-03	Changed	False	7314	[ "src/Lean/Elab/Structure.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7315 implements the Cooper conflict resolution in cutsat. We still	2025-04-03	Changed	False	7315	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Cooper.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/SearchM.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Types.lean", "src/Lean/Meta/Tactic/Grind/Arit...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7324 changes the internal construction of well-founded recursion, to	2025-04-03	Changed	False	7324	[ "src/Lean/Elab/PreDefinition/WF/Fix.lean", "src/Lean/Meta/Match/MatcherApp/Transform.lean", "tests/lean/run/issue7322.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7329 adds support to bv_decide for simple pattern matching on enum	2025-04-03	Changed	False	7329	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/ApplyControlFlow.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Basic.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Enums.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/I...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7333 allows aux decls (like generated by `match`) to be generated by	2025-04-03	Changed	False	7333	[ "src/Lean/Elab/PreDefinition/WF/Fix.lean", "src/Lean/Elab/PreDefinition/WF/GuessLex.lean", "src/Lean/Elab/PreDefinition/WF/Main.lean", "tests/lean/run/issue7332.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7335 modifies `elabTerminationByHints` in a way that the type of the	2025-04-03	Changed	False	7335	[ "src/Lean/Elab/PreDefinition/TerminationMeasure.lean", "tests/lean/run/issue6531.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7339 implements cooper conflict resolution in the cutsat procedure.	2025-04-03	Changed	False	7339	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DvdCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/LeCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", ...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7347 upgrades the CaDiCal we ship and use for bv_decide to version	2025-04-03	Changed	False	7347	[ "CMakeLists.txt", "flake.lock", "flake.nix", "src/Lean/Elab/Tactic/BVDecide/Frontend/LRAT.lean", "src/Std/Tactic/BVDecide/Syntax.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7348 ensures all equation and unfold theorem generators in core are	2025-04-03	Changed	False	7348	[ "src/Lean/Elab/PreDefinition/EqUnfold.lean", "src/Lean/Elab/PreDefinition/Eqns.lean", "src/Lean/Elab/PreDefinition/PartialFixpoint/Eqns.lean", "src/Lean/Elab/PreDefinition/Structural/Eqns.lean", "src/Lean/Elab/PreDefinition/WF/Unfold.lean", "src/Lean/Meta/Eqns.lean", "src/lean.mk.in", "tests/lean/run/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7351 ensures cutsat does not have to perform case analysis in the	2025-04-03	Changed	False	7351	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Types.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Util.lean", "tests/lean/run/grind_cutsat_cooper.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7353 changes `abstractNestedProofs` so that it also visits the	2025-04-03	Changed	False	7353	[ "src/Lean/Meta/AbstractNestedProofs.lean", "tests/lean/run/7353.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7355 fixes a bug in the `markNestedProofs` preprocessor used in the	2025-04-03	Changed	False	7355	[ "src/Lean/Meta/Tactic/Grind/MarkNestedProofs.lean", "tests/lean/run/grind_mark_nested_proofs_bug.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7357 adds support for `/` and `%` to the cutsat procedure.	2025-04-03	Changed	False	7357	[ "src/Init/Data/Int/Linear.lean", "src/Init/Grind/Norm.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DivMod.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/A...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7362 allows simp dischargers to add aux decls to the environment.	2025-04-03	Changed	False	7362	[ "src/Lean/Elab/Tactic/Simp.lean", "src/Lean/Elab/Term.lean", "tests/lean/run/issue7318.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7369 uses `let`-declarations for each polynomial occurring in a proof	2025-04-03	Changed	False	7369	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Util.lean", "tests/lean/run/grind_cutsat_cooper.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7370 simplifies the proof term due to the Cooper's conflict	2025-04-03	Changed	False	7370	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7373 implements the last missing case for the cutsat procedure and	2025-04-03	Changed	False	7373	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/Types.lean", "tests/lean/run/grind_cutsat_diseq_cooper.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7381 refactors the AIG datastructures that underly bv_decide in order	2025-04-03	Changed	False	7381	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "src/Std/Sat/AIG/Basic.lean", "src/Std/Sat/AIG/CNF.lean", "src/Std/Sat/AIG/Cached.lean", "src/Std/Sat/AIG/CachedGates.lean", "src/Std/Sat/AIG/CachedGatesLemmas.lean", "src/Std/Sat/AIG/CachedLemmas.lean", "src/Std/Sat/AIG/If.lean", "src...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7387 uses `-implicitDefEqProofs` in `bv_omega` to ensure it is not	2025-04-03	Changed	False	7387	[ "src/Init/Tactics.lean", "src/kernel/type_checker.cpp" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7390 makes bv_decide's preprocessing handle casts, as we are in the	2025-04-03	Changed	False	7390	[ "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean", "tests/lean/run/bv_relation.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7392 fixes an issue in the `grind` tactic when case splitting on	2025-04-03	Changed	False	7392	[ "src/Init/Grind/Util.lean", "src/Lean/Meta/Tactic/Grind/Intro.lean", "src/Lean/Meta/Tactic/Grind/Split.lean", "tests/lean/run/grind_ite_split_issue.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7394 adds infrastructure necessary for supporting `Nat` in the cutsat	2025-04-03	Changed	False	7394	[ "src/Init/Data/Int.lean", "src/Init/Data/Int/Linear.lean", "src/Init/Data/Int/OfNat.lean", "src/Init/Grind/Norm.lean", "src/Lean/Expr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DivMod.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/LeCnstr.lean", ...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7396 fixes a bug in the cutsat model construction. It was searching	2025-04-03	Changed	False	7396	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "tests/lean/run/grind_cutsat_upper_bug.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7397 ensures that `Poly.mul p 0` always returns `Poly.num 0`.	2025-04-03	Changed	False	7397	[ "src/Init/Data/Int/Linear.lean", "tests/lean/run/grind_Poly_mul_0_bug.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7401 improves the cutsat model search procedure by tightening	2025-04-03	Changed	False	7401	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DvdCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Types.lean", "sr...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7407 adds rules for `-1#w * a = -a` and `a * -1#w = -a` to	2025-04-03	Changed	False	7407	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7409 allows the use of `dsimp` during preprocessing of well-founded	2025-04-03	Changed	False	7409	[ "src/Init/Data/Array/Monadic.lean", "src/Init/Data/List/Monadic.lean", "src/Lean/Elab/PreDefinition/WF/Preprocess.lean", "src/Lean/Meta/Tactic/Simp/Main.lean", "tests/lean/run/issue7408.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7417 adds support for enum inductive matches with default branches to	2025-04-03	Changed	False	7417	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Basic.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Enums.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/TypeAnalysis.lean", "tests/lean/run/bv_enums.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7429 adds the BV_EXTRACT_FULL preprocessing rule from Bitwuzla to	2025-04-03	Changed	False	7429	[ "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7431 changes the syntax of location modifiers for tactics like `simp`	2025-04-03	Changed	False	7431	[ "src/Init/Tactics.lean", "src/Lean/Elab/Tactic/Location.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7436 adds simprocs that turn left and right shifts by constants into	2025-04-03	Changed	False	7436	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7438 adds the EQUAL_CONST_BV_ADD and BV_AND_CONST rules to	2025-04-03	Changed	False	7438	[ "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7441 adds the BV_CONCAT_CONST, BV_CONCAT_EXTRACT and ELIM_ZERO_EXTEND	2025-04-03	Changed	False	7441	[ "src/Init/Data/BitVec/Lemmas.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reflect.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reify.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Basic.lean", "src/Std/Tactic/BVDecide/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7457 ensures info tree users such as linters and request handlers	2025-04-03	Changed	False	7457	[ "src/Init.lean", "src/Init/System/IO.lean", "src/Init/Task.lean", "src/Lean/CoreM.lean", "src/Lean/Elab/Command.lean", "src/Lean/Elab/Frontend.lean", "src/Lean/Elab/InfoTree/Main.lean", "src/Lean/Elab/InfoTree/Types.lean", "src/Lean/Elab/InfoTrees.lean", "src/Lean/Language/Lean.lean", "src/Lean/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7477 ensures that bv_decide doesn't accidentally operate on terms	2025-04-03	Changed	False	7477	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Enums.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/IntToBitVec.lean", "tests/lean/run/7475.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7480 adds the necessary rewrites for the Bitwuzla rules	2025-04-03	Changed	False	7480	[ "src/Init/Data/BitVec/Lemmas.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reflect.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reify.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Basic.lean", "src/Std/Tactic/BVDecide/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7486 adds the BitVec.add_neg_mul rule introduced in #7481 to	2025-04-03	Changed	False	7486	[ "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7491 achieves a speed up in bv_decide's LRAT checker by improving its	2025-04-03	Changed	False	7491	[ "src/Std/Sat/CNF/Literal.lean", "src/Std/Tactic/BVDecide/LRAT/Internal/Actions.lean", "src/Std/Tactic/BVDecide/LRAT/Internal/Assignment.lean", "src/Std/Tactic/BVDecide/LRAT/Internal/Clause.lean", "src/Std/Tactic/BVDecide/LRAT/Internal/Convert.lean", "src/Std/Tactic/BVDecide/LRAT/Internal/Formula/Implement...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7494 implements support for `Nat` inequalities in the cutsat	2025-04-03	Changed	False	7494	[ "src/Init/Data/Int/Linear.lean", "src/Init/Data/Int/OfNat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DvdCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/LeCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Nat.lean", "src/Lean/Meta/Tac...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7495 implements support for `Nat` divisibility constraints in the	2025-04-03	Changed	False	7495	[ "src/Init/Data/Int/Linear.lean", "src/Init/Data/Int/OfNat.lean", "src/Lean/Meta/NatInstTesters.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DvdCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Nat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Proof.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsa...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7501 implements support for `Nat` equalities and disequalities in the	2025-04-03	Changed	False	7501	[ "src/Init/Data/Int/Linear.lean", "src/Init/Data/Int/OfNat.lean", "src/Init/Grind/Norm.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DivMod.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Nat.lean", ...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7502 implements support for `Nat` div and mod in the cutsat	2025-04-03	Changed	False	7502	[ "src/Lean/Expr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DivMod.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "tests/lean/run/grind_cutsat_nat_eq.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7503 implements support for `Nat.sub` in cutsat	2025-04-03	Changed	False	7503	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Simp/BuiltinSimprocs/Int.lean", "tests/lean/run/grind_cutsat_nat_eq.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7509 disables the `implicitDefEqProofs` simp option in the	2025-04-03	Changed	False	7509	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/EmbeddedConstraint.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Enums.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/IntToBitVec.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Rewrite.lean", "src/Lean/Elab/Tactic/BVDecide/Fron...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7510 ensures that `grind` can be used as a more powerful	2025-04-03	Changed	False	7510	[ "src/Init/Grind/Lemmas.lean", "src/Lean/Meta/Tactic/Grind/Intro.lean", "src/Lean/Meta/Tactic/Grind/Main.lean", "src/Lean/Meta/Tactic/Grind/Util.lean", "tests/lean/run/grind_exfalso.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7511 fixes two bugs in `simp +arith` that were preventing specific	2025-04-03	Changed	False	7511	[ "src/Lean/Meta/Tactic/Simp/Arith/Int/Simp.lean", "src/Lean/Meta/Tactic/Simp/Main.lean", "tests/lean/run/simp_arith_issues.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7512 adds missing normalization rules for `Nat` div and mod to the	2025-04-03	Changed	False	7512	[ "src/Init/Grind/Norm.lean", "tests/lean/run/grind_cutsat_nat_eq.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7514 adds more missing normalization rules for `div` and `mod` to	2025-04-03	Changed	False	7514	[ "src/Init/Grind/Norm.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "tests/lean/run/grind_cutsat_tests.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7515 fixes another bug in `simp +arith`. This bug was affecting	2025-04-03	Changed	False	7515	[ "src/Init/Data/Nat/Linear.lean", "src/Lean/Meta/Tactic/Simp/Arith.lean", "src/Lean/Meta/Tactic/Simp/Arith/Nat/Simp.lean", "src/Lean/Meta/Tactic/Simp/Arith/Util.lean", "src/Lean/Meta/Tactic/Simp/Rewrite.lean", "tests/lean/run/simpCnstr1.lean", "tests/lean/run/simp_arith_issues.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7521 adds the equivalent of `Array.emptyWithCapacity` to the AIG	2025-04-03	Changed	False	7521	[ "src/Std/Sat/AIG/If.lean", "src/Std/Sat/AIG/RefVec.lean", "src/Std/Sat/AIG/RefVecOperator/Map.lean", "src/Std/Sat/AIG/RefVecOperator/Zip.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Const.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Operations/Add.lean", "src/Std/Tactic/B...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7527 adds the BV_EXTRACT_CONCAT_LHS_RHS, NORM_BV_ADD_MUL and	2025-04-03	Changed	False	7527	[ "src/Init/Data/BitVec/Lemmas.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "src/Std/Tactic/BVDecide/Normalize/BitVec.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7532 fixes the procedure for putting new facts into the `grind`	2025-04-03	Changed	False	7532	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Var.lean", "src/Lean/Meta/Tactic/Grind/Simp.lean", "src/Lean/Meta/Tactic/Grind/Types.lean", "tests/lean/run/grind_canon_insts.lean", "tests/lean/run/grind_cutsat_div_mod.lean...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7536 implements support for `¬ d ∣ p` in the cutsat procedure.	2025-04-03	Changed	False	7536	[ "src/Init/Data/Int/Linear.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/DvdCnstr.lean", "tests/lean/run/grind_cutsat_div_1.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7537 implements support for `Int.natAbs` and `Int.toNat` in the	2025-04-03	Changed	False	7537	[ "src/Init/Data/Int/OfNat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/EqCnstr.lean", "tests/lean/run/grind_cutsat_nat_eq.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7538 fixes a bug in the cutsat model construction. It was not	2025-04-03	Changed	False	7538	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "tests/lean/run/grind_cutsat_nat_dvd.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7540 adds `[grind cases eager]` attribute to `Subtype`. See new test.	2025-04-03	Changed	False	7540	[ "src/Init/Grind/Cases.lean", "tests/lean/run/grind_cutsat_auto.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7551 changes `isNatCmp` to ignore optional arguments annotations,	2025-04-03	Changed	False	7551	[ "src/Lean/Elab/PreDefinition/WF/GuessLex.lean", "tests/lean/run/7458.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7553 removes a bad normalization rule in `grind`, and adds a missing	2025-04-03	Changed	False	7553	[ "src/Init/Grind/Norm.lean", "src/Lean/Meta/Tactic/Simp/BuiltinSimprocs/Int.lean", "tests/lean/run/grind_cutsat_nat_dvd.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7560 ensures that we use the same ordering to normalize linear `Int`	2025-04-03	Changed	False	7560	[ "src/Lean/Meta/Tactic/Simp/Arith/Int/Basic.lean", "tests/lean/run/grind_cutsat_nat_dvd.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7561 fixes the support for nonlinear `Nat` terms in cutsat. For	2025-04-03	Changed	False	7561	[ "src/Init/Data/Int/OfNat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Nat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Var.lean", "src/Lean/Meta/Tactic/Grind/Simp.lean", "tests/lean/run/grind_canon_insts.lean", "tests/lean/run/grind_cutsat_nat_dvd.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7579 improves the counterexamples produced by the cutsat procedure,	2025-04-03	Changed	False	7579	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Model.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Search.lean", "src/Lean/Meta/Tactic/Grind/PP.lean", "tests/lean/run/grind_cutsat_div_mod.lean", "tests/lean/run/grind_cutsat_nat_eq.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7615 adds the ADD part of bitwuzlas BV_EXTRACT_ADD_MUL rule to	2025-04-03	Changed	False	7615	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7617 adds the known bits optimization from the multiplication circuit	2025-04-03	Changed	False	7617	[ "src/Std/Sat/AIG/RefVec.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Operations/Add.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Operations/Mul.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Lemmas/Operations/Add.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circui...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7622 fixes `fun_induction` when used on structurally recursive	2025-04-03	Changed	False	7622	[ "src/Lean/Meta/Tactic/FunInd.lean", "tests/lean/run/issue7550.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7630 fixes a performance issue in the `whnfCore` procedure.	2025-04-03	Changed	False	7630	[ "src/Lean/Meta/WHNF.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7636 makes sure that the expression level cache in bv_decide is	2025-04-03	Changed	False	7636	[ "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Expr.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Pred.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Circuit/Impl/Substructure.lean", "src/Std/Tactic/BVDecide/Bitblast/BVExpr/...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7640 implements the main logic for inheriting and overriding	2025-04-03	Changed	False	7640	[ "src/Lean/Elab/Binders.lean", "src/Lean/Elab/Structure.lean", "src/Lean/Structure.lean", "tests/lean/run/461a.lean", "tests/lean/run/structureElab.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7641 implements basic model-based theory combination in `grind`.	2025-04-03	Changed	False	7641	[ "src/Init/Grind/Tactics.lean", "src/Lean/Meta/Tactic/Grind.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/MBTC.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Model.lean", "src/Lean/Meta/Tactic/Grind/MBTC.lean", "src/Lean/Meta/Tactic/Grind/Solve.lean", ...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7644 adds a cache to the reflection procedure of bv_decide.	2025-04-03	Changed	False	7644	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reflect.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reify.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7649 changes the AIG representation of constants from `const (b :	2025-04-03	Changed	False	7649	[ "src/Std/Sat/AIG/Basic.lean", "src/Std/Sat/AIG/CNF.lean", "src/Std/Sat/AIG/Cached.lean", "src/Std/Sat/AIG/CachedLemmas.lean", "src/Std/Sat/AIG/Lemmas.lean", "src/Std/Sat/AIG/RefVec.lean", "src/Std/Sat/AIG/Relabel.lean", "src/Std/Sat/AIG/RelabelNat.lean", "tests/lean/run/aig_optimizations.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7652 gives `#print` for structures the ability to show the default	2025-04-03	Changed	False	7652	[ "src/Lean/Elab/Print.lean", "tests/lean/printStructure.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7655 adds the preprocessing rule for extraction over multiplication	2025-04-03	Changed	False	7655	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/Normalize/Simproc.lean", "tests/lean/run/bv_decide_rewriter.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7663 uses computed fields to store the hash code and pointer equality	2025-04-03	Changed	False	7663	[ "src/Std/Tactic/BVDecide/Bitblast/BVExpr/Basic.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7670 improves the caching computation of the atoms assignment in	2025-04-03	Changed	False	7670	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reflect.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7698 adds more sharing and caching procedures to bv_decide's	2025-04-03	Changed	False	7698	[ "src/Lean/Elab/Tactic/BVDecide/Frontend/BVCheck.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/Reflect.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/ReifiedBVExpr.lean", "src/Lean/Elab/Tactic/BVDecide/Frontend/BVDecide/ReifiedBVLogic...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7712 ensures `grind` always abstract its own proofs into an auxiliary	2025-04-03	Changed	False	7712	[ "src/Lean/Elab/Tactic/Grind.lean", "tests/lean/run/grind_offset_cnstr.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7714 fixes an assertion violation in the `grind` model-based theory	2025-04-03	Changed	False	7714	[ "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/MBTC.lean", "src/Lean/Meta/Tactic/Grind/Arith/Cutsat/Model.lean" ]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	#7717 changes how `{...}`/`where` notation ("structure instance	2025-04-03	Changed	False	7717	[ "src/Init/Internal/Order/Basic.lean", "src/Lean/Elab/MutualInductive.lean", "src/Lean/Elab/Print.lean", "src/Lean/Elab/StructInst.lean", "src/Lean/Elab/Structure.lean", "src/Lean/Elab/Tactic/Omega/Core.lean", "src/Lean/Meta/Structure.lean", "src/Lean/Structure.lean", "src/lake/Lake/Load/Toml.lean", ...	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	When fields are elaborated, their expected types now have a couple	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4
v4.19.0-rc2	Language	All parents can now be used as field names, not just the subobject	2025-04-03	Changed	False		[]	https://github.com/leanprover/lean4

End of preview. Expand in Data Studio

Lean4-Changelog

Lean 4 release-note changelog entries, parsed from the GitHub releases API.

Source

Repository: https://github.com/leanprover/lean4
Entries: 3,419
Versions: 29

Schema

Column	Type	Description
version	string
section	string
text	string
date	string
change_type	string
is_breaking	string
pr_number	string
files_changed	list
source_url	string

Statistics

Entries: 3,419
Versions: 29 (v4.0.0 … v4.9.0)

By change type

Change type	Count
Changed	3,332
Breaking	87

By section

Section	Count
Library	991
Language	802
Language features, tactics, and metaprograms	422
General	262
Lean internals	194
Lake	131
Merged PRs	79
Compiler	57
Breaking changes	57
Documentation	56
DevOps/CI	50
Compiler, runtime, and FFI	43
Server	42
Pretty printing	33
Language server, widgets, and IDE extensions	30

Example

{
  "version": "v4.19.0-rc2",
  "section": "Language",
  "text": "#5182 makes functions defined by well-founded recursion use an",
  "date": "2025-04-03",
  "change_type": "Changed",
  "is_breaking": "False",
  "pr_number": "5182",
  "files_changed": [
    "src/Init/Core.lean",
    "src/Init/Data/Array/Attach.lean",
    "src/Init/Data/Array/Erase.lean"
  ],
  "source_url": "https://github.com/leanprover/lean4"
}

Note

Per-change date and files_changed are mined from the GitHub API (pull-request metadata); pr_number links each entry to its upstream change.

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