revlog.py: always return tuples from parents and parentrevs There's at least one place doing parentrevs(rev) != (rev-1, -1), which is always true with revlog v0, since parentrevs returns a list in this case.

#!/usr/bin/env python
#

import doctest

import mercurial.changelog
# test doctest from changelog

doctest.testmod(mercurial.changelog)