diff -r 649d3ac37a12 -r d783f945a701 mercurial/utils/cborutil.py
--- a/mercurial/utils/cborutil.py	Sun Oct 06 19:25:18 2019 -0400
+++ b/mercurial/utils/cborutil.py	Mon Oct 07 00:04:04 2019 -0400
@@ -176,7 +176,7 @@
     yield encodelength(MAJOR_TYPE_MAP, len(d))
 
     for key, value in sorted(
-        d.iteritems(), key=lambda x: _mixedtypesortkey(x[0])
+        pycompat.iteritems(d), key=lambda x: _mixedtypesortkey(x[0])
     ):
         for chunk in streamencode(key):
             yield chunk