t / t5100 / info0011on commit get_sha1: warn about full or short object names that look like refs (798c35f)
   1Author: A U Thor
   2Email: a.u.thor@example.com
   3Subject: Xyzzy
   4Date: Fri, 8 Aug 2008 13:08:37 +0200 (CEST)
   5