diff -r 649d3ac37a12 -r d783f945a701 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Sun Oct 06 19:25:18 2019 -0400
+++ b/mercurial/dispatch.py	Mon Oct 07 00:04:04 2019 -0400
@@ -540,7 +540,7 @@
 
         try:
             aliases, entry = cmdutil.findcmd(self.name, cmdtable)
-            for alias, e in cmdtable.iteritems():
+            for alias, e in pycompat.iteritems(cmdtable):
                 if e is entry:
                     self.cmd = alias
                     break