transaction: explain why some recovery failed
Right now we issue a message about failing to recover some file, but not why.
It seems useful to add some information about that.
(This is an opportunity improvement while looking at something next to that.)
Differential Revision: https://phab.mercurial-scm.org/D10842
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)