Ran into this when preparing my --no-contains series, this is a long
standing bug:
$ ./git branch -D test; ./git branch --contains v2.8.0 test; echo
$?; git rev-parse test
error: branch 'test' not found.
0
test
fatal: ambiguous argument 'test': unknown revision or path not in
the working tree.
I.e. this should return an error like "git tag" does:
$ ./git tag -d test; ./git tag --contains v2.8.0 test; echo $?;
git rev-parse test
error: tag 'test' not found.
fatal: --contains option is only allowed with -l.
128
test
fatal: ambiguous argument 'test': unknown revision or path not in
the working tree.
I briefly looked through builtin/branch.c, couldn't find a trivial way
to patch it, unfamiliar with the code, didn't want to forget about it,
hence this E-Mail.
