py3: stop using deprecated Element.getchildren() method in convert/darcs
This has been deprecated since py3.2, and removed entirely in py3.9
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)