diff -r 9f84ccb1b282 -r fe5e30b58934 mercurial/upgrade.py
--- a/mercurial/upgrade.py	Mon Apr 10 18:01:29 2017 +0200
+++ b/mercurial/upgrade.py	Mon Apr 10 18:03:11 2017 +0200
@@ -78,7 +78,7 @@
         'store',
     ])
 
-def upgradeallowednewrequirements(repo):
+def allowednewrequirements(repo):
     """Obtain requirements that can be added to a repository during upgrade.
 
     This is used to disallow proposed requirements from being added when
@@ -613,7 +613,7 @@
                             'removed: %s') % _(', ').join(sorted(noremovereqs)))
 
     noaddreqs = (newreqs - repo.requirements -
-                 upgradeallowednewrequirements(repo))
+                 allowednewrequirements(repo))
     if noaddreqs:
         raise error.Abort(_('cannot upgrade repository; do not support adding '
                             'requirement: %s') %