diff -r 5881d5b7552f -r 8b846dbc57b6 mercurial/context.py
--- a/mercurial/context.py	Tue Dec 04 12:54:18 2012 -0800
+++ b/mercurial/context.py	Tue Dec 04 12:54:18 2012 -0800
@@ -355,6 +355,9 @@
     def dirs(self):
         return self._dirs
 
+    def dirty(self):
+        return False
+
 class filectx(object):
     """A filecontext object makes access to data related to a particular
        filerevision convenient."""