--- a/hgext/evolve.py	Fri Mar 13 09:05:34 2015 -0700
+++ b/hgext/evolve.py	Wed Apr 01 14:37:02 2015 -0700
@@ -1422,7 +1422,7 @@
         files = set()
         copied = copies.pathcopies(prec, bumped)
         precmanifest = prec.manifest()
-        for key, val in bumped.manifest().iteritems():
+        for key, val in list(bumped.manifest().iteritems()):
             precvalue = precmanifest.get(key, None)
             if precvalue is not None:
                 del precmanifest[key]