t / t5100 / rfc2047-info-0004on commit rev-parse: exit with non-zero status if ref@{n} is not valid. (e6eedc3)
   1Author: Nathaniel Borenstein (םולש ןב ילטפנ)
   2Email: nsb@thumper.bellcore.com
   3Subject: Test of new header generator
   4