--- a/hgext3rd/topic/stack.py	Tue Mar 15 17:26:57 2016 +0000
+++ b/hgext3rd/topic/stack.py	Mon Mar 14 18:39:19 2016 +0000
@@ -8,7 +8,7 @@
 from mercurial import extensions
 from mercurial import obsolete
 
-def _getstack(repo, topic):
+def getstack(repo, topic):
     # XXX need sorting
     trevs = repo.revs("topic(%s) - obsolete()", topic)
     return _orderrevs(repo, trevs)
@@ -18,7 +18,7 @@
         topic = repo.currenttopic
     if not topic:
         raise error.Abort(_('no active topic to list'))
-    for idx, r in enumerate(_getstack(repo, topic)):
+    for idx, r in enumerate(getstack(repo, topic)):
         # super crude initial version
         l = "%d: %s\n" % (idx, repo[r].description().splitlines()[0])
         ui.write(l)