--- a/mercurial/revset.py	Fri Oct 10 12:30:56 2014 -0700
+++ b/mercurial/revset.py	Fri Oct 10 12:31:22 2014 -0700
@@ -2352,7 +2352,7 @@
 
     @util.propertycache
     def __contains__(self):
-        return self.set().__contains__
+        return self._set.__contains__
 
     def __nonzero__(self):
         return bool(self._list)