[Bug 3850] New: tag() revset is inconsistent with branch() when name is given as regex

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=3850

          Priority: normal
            Bug ID: 3850
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: tag() revset is inconsistent with branch() when name
                    is given as regex
          Severity: bug
    Classification: Unclassified
                OS: All
          Reporter: michalsznajder at gmail.com
          Hardware: All
            Status: UNCONFIRMED
           Version: 2.5.1
         Component: Mercurial
           Product: Mercurial

If there is no branch matching regex then nothing is returned:

    $ hg log --rev "branch('re:unknown')" ; echo $?
    0

However for unknown tag error is reported:

    $ hg log --rev "tag('re:unknown')" ; echo $?
    abort: no tags exist that match 'unknown'
    255

I would expect that in case no tags are matching revset no revision is reported
and no error code is returned.

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