--- a/mercurial/pycompat.py	Sat Aug 13 03:03:01 2016 +0530
+++ b/mercurial/pycompat.py	Sat Aug 13 04:21:42 2016 +0530
@@ -41,11 +41,10 @@
 
     copies items from origin to alias
     """
-    def hgcase(item):
-        return item.replace('_', '').lower()
     for item in items:
         try:
-            setattr(alias, hgcase(item), getattr(origin, item))
+            lcase = item.replace('_', '').lower()
+            setattr(alias, lcase, getattr(origin, item))
         except AttributeError:
             pass