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BUG: "git branch --contains <commit> <name>" does nothing, silently fails




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.