diff -r e76aec3eddc4 -r 7bbc35c43bff mercurial/revset.py
--- a/mercurial/revset.py	Fri Oct 03 01:44:52 2014 -0500
+++ b/mercurial/revset.py	Thu Oct 02 19:47:33 2014 -0500
@@ -2786,7 +2786,7 @@
     return _spanset(repo, start, end)
 
 
-class _spanset(_orderedsetmixin, abstractsmartset):
+class _spanset(abstractsmartset):
     """Duck type for baseset class which represents a range of revisions and
     can work lazily and without having all the range in memory