diff -r 9b73ab9bcbfb -r 45afc86567ce mercurial/revset.py
--- a/mercurial/revset.py	Wed Oct 08 02:48:56 2014 -0700
+++ b/mercurial/revset.py	Wed Oct 08 02:49:17 2014 -0700
@@ -1151,9 +1151,9 @@
     for the first operation is selected.
     """
     if x is not None:
-        args = getset(repo, spanset(repo), x).set()
+        args = getset(repo, spanset(repo), x)
     else:
-        args = getall(repo, spanset(repo), x).set()
+        args = getall(repo, spanset(repo), x)
 
     def _firstsrc(rev):
         src = _getrevsource(repo, rev)