diff -r 1c6f4970f3e8 -r eadcc5f8edf6 hgext3rd/topic/stack.py
--- a/hgext3rd/topic/stack.py	Mon Mar 21 21:28:29 2016 -0700
+++ b/hgext3rd/topic/stack.py	Mon Mar 21 21:29:35 2016 -0700
@@ -5,7 +5,6 @@
 import collections
 from mercurial.i18n import _
 from mercurial import error
-from mercurial import extensions
 from mercurial import obsolete
 
 def getstack(repo, topic):