diff -r e15027cc4cd8 -r eed95fe914c5 mercurial/revset.py
--- a/mercurial/revset.py	Wed Oct 08 02:50:20 2014 -0700
+++ b/mercurial/revset.py	Wed Oct 08 02:51:16 2014 -0700
@@ -1656,7 +1656,7 @@
     if not s:
         return baseset()
     ls = [repo[r].rev() for r in s.split('\0')]
-    s = subset.set()
+    s = subset
     return baseset([r for r in ls if r in s])
 
 # for internal use