--- a/mercurial/util.py	Sun Sep 03 15:16:01 2017 +0900
+++ b/mercurial/util.py	Sun Sep 03 17:33:10 2017 +0900
@@ -584,7 +584,7 @@
     >>> d2
     sortdict([('a', 0), ('b', 1)])
     >>> d2.update([(b'a', 2)])
-    >>> d2.keys() # should still be in last-set order
+    >>> list(d2.keys()) # should still be in last-set order
     ['b', 'a']
     '''