t / t4101 / diff.0-2on commit t9001: send-email interation with --in-reply-to and --chain-reply-to (54aae5e)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,2 +1,2 @@
   4 a
   5-b
   6+b
   7\ No newline at end of file