--- a/mercurial/revset.py	Wed Oct 01 00:26:50 2014 -0500
+++ b/mercurial/revset.py	Thu Oct 02 19:21:40 2014 -0500
@@ -2274,7 +2274,7 @@
         """Returns a new object with the intersection of the two collections.
 
         This is part of the mandatory API for smartset."""
-        raise NotImplementedError()
+        return self.filter(other.__contains__)
 
     def __add__(self, other):
         """Returns a new object with the union of the two collections.