go/src/internal/diff/testdata/dups.txt

-- old --
a

b

c

d

e

f
-- new --
a

B

C

d

e

f
-- diff --
diff old new
--- old
+++ new
@@ -1,8 +1,8 @@
 a
 $
-b
-
-c
+B
+
+C
 $
 d
 $