tests/crashgetbundler.py

revlog: add some documentation to the `checksize` method

I had to look at it, so I figured I would leave some documentation for the next
person seeking information.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
        changegroup,
        error,
        extensions
    )

def abort(orig, *args, **kwargs):
    raise error.Abort(_('this is an exercise'))

def uisetup(ui):
    extensions.wrapfunction(changegroup, 'getbundler', abort)