t / t4101 / diff.2-1on commit sequencer (rebase -i): add support for the 'fixup' and 'squash' commands (6e98de7)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,2 +1,3 @@
   4 a
   5-b
   6\ No newline at end of file
   7+b
   8+c