diff -r a0674e916fb6 -r f254fc73d956 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Thu Mar 03 17:39:20 2022 -0800
+++ b/mercurial/subrepo.py	Thu Mar 03 18:28:30 2022 -0800
@@ -1770,7 +1770,7 @@
             for b in rev2branch[self._state[1]]:
                 if b.startswith(b'refs/remotes/origin/'):
                     return True
-        for b, revision in pycompat.iteritems(branch2rev):
+        for b, revision in branch2rev.items():
             if b.startswith(b'refs/remotes/origin/'):
                 if self._gitisancestor(self._state[1], revision):
                     return True