diff -r 22c669f3a7f9 -r 52c81f2963fc mercurial/revset.py
--- a/mercurial/revset.py	Fri Oct 03 01:23:12 2014 -0500
+++ b/mercurial/revset.py	Fri Oct 03 01:24:30 2014 -0500
@@ -2462,9 +2462,6 @@
             return None
         return lambda: self._iterfilter(it())
 
-    def __sub__(self, x):
-        return filteredset(self, lambda r: r not in x)
-
     def __add__(self, x):
         return _addset(self, x)