mercurial/context.py

--- a/mercurial/context.py	Mon Jun 25 15:14:05 2012 -0700
+++ b/mercurial/context.py	Wed Jun 27 13:41:04 2012 -0500
@@ -1054,7 +1054,7 @@
                 wlock.release()
 
     def dirs(self):
-        return self._repo.dirstate.dirs()
+        return set(self._repo.dirstate.dirs())
 
 class workingfilectx(filectx):
     """A workingfilectx object makes access to data related to a particular