--- a/mercurial/obsutil.py	Sun Oct 06 19:25:18 2019 -0400
+++ b/mercurial/obsutil.py	Mon Oct 07 00:04:04 2019 -0400
@@ -15,6 +15,7 @@
     encoding,
     node as nodemod,
     phases,
+    pycompat,
     util,
 )
 from .utils import dateutil
@@ -983,7 +984,7 @@
             base[tuple(nsuccset)] = n
     return [
         {b'divergentnodes': divset, b'commonpredecessor': b}
-        for divset, b in base.iteritems()
+        for divset, b in pycompat.iteritems(base)
     ]