diff -r 6894223ebc38 -r fb9852c46a42 mercurial/revset.py
--- a/mercurial/revset.py	Thu Mar 13 13:29:04 2014 -0700
+++ b/mercurial/revset.py	Thu Mar 13 18:57:30 2014 -0700
@@ -2409,6 +2409,11 @@
     def set(self):
         return self
 
+    def reverse(self):
+        self._list.reverse()
+        if self._ascending is not None:
+            self._ascending = not self._ascending
+
 class _generatorset(object):
     """Wrap a generator for lazy iteration