t / t5100 / info0011on commit rev-parse: exit with non-zero status if ref@{n} is not valid. (e6eedc3)
   1Author: A U Thor
   2Email: a.u.thor@example.com
   3Subject: Xyzzy
   4Date: Fri, 8 Aug 2008 13:08:37 +0200 (CEST)
   5