--- a/hgext3rd/topic/revset.py Mon Mar 21 21:28:12 2016 -0700
+++ b/hgext3rd/topic/revset.py Mon Mar 21 21:28:29 2016 -0700
@@ -1,5 +1,7 @@
+from mercurial import error
from mercurial import revset
from mercurial import util
+from mercurial.i18n import _
from . import constants, destination, stack