--- a/hgext3rd/evolve/obshistory.py	Fri Jun 16 16:51:31 2017 +0200
+++ b/hgext3rd/evolve/obshistory.py	Fri Jun 16 17:54:27 2017 +0200
@@ -671,7 +671,7 @@
 
     return markers
 
-def _preparesuccessorset(successorset, pathscache):
+def preparesuccessorset(successorset, pathscache):
     """ For a successor set, get all related markers, compute the set of user,
     the min date and the max date
     """