--- a/mercurial/revset.py	Tue Mar 11 16:59:42 2014 -0700
+++ b/mercurial/revset.py	Thu Mar 13 14:51:04 2014 -0700
@@ -2353,8 +2353,9 @@
         return self._iter
 
     def __iter__(self):
-        for r in self._iterator():
-            yield r
+        if self._genlist:
+            return iter(self._genlist)
+        return iter(self._iterator())
 
     def __contains__(self, x):
         return x in self._r1 or x in self._r2