mercurial/context.py

--- a/mercurial/context.py	Thu Aug 15 15:20:56 2013 -0500
+++ b/mercurial/context.py	Thu Aug 15 15:23:36 2013 -0500
@@ -1586,7 +1586,7 @@
         """commit context to the repo"""
         return self._repo.commitctx(self)
 
-class memfilectx(object):
+class memfilectx(committablefilectx):
     """memfilectx represents an in-memory file to commit.
 
     See memctx for more details.