--- a/mercurial/revset.py	Wed Sep 17 10:59:40 2014 -0700
+++ b/mercurial/revset.py	Wed Sep 17 19:57:09 2014 -0700
@@ -468,7 +468,7 @@
         bms = set([repo[r].rev()
                    for r in repo._bookmarks.values()])
     bms -= set([node.nullrev])
-    return subset.filter(bms.__contains__)
+    return subset & bms
 
 def branch(repo, subset, x):
     """``branch(string or set)``