t / t4101 / diff.1-3on commit get_packed_ref_cache(): assume "packed-refs" won't change while locked (28ed983)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,3 +1,3 @@
   4 a
   5-b
   6 c
   7+b
   8\ No newline at end of file