rust-cpython: add generation counter to leaked reference
This counter increments on borrow_mut() to invalidate existing leaked
references. This is modeled after the iterator invalidation in Python.
The other checks will be adjusted by the subsequent patches.
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)