stablerangecache: sanity check subranges
Try to detect invalid conditions on insert as would result in deep
recursions and final aborts much later. This has been observed on two
different machines and the check makes it hopefully possible to find the
origin of the problem.
# Copyright 2019 Pierre-Yves David <pierre-yves.david@octobus.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
def hastopicext(repo):
"""True if the repo use the topic extension"""
return getattr(repo, 'hastopicext', False)