[PATCH 3 of 8] revset: added lazyset implementation to filelog revset

[Lucas Moscovicz]

# HG changeset patch
# User Lucas Moscovicz <lmoscovicz at fb.com>
# Date 1391473699 28800
#      Mon Feb 03 16:28:19 2014 -0800
# Node ID f34fe1564f148a4c6e70e2e0e1409f8f723cf772
# Parent  bccc2dbcf3b60c9c2d0721c7ca5ebd09fa460c50
revset: added lazyset implementation to filelog revset

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -742,7 +742,7 @@
                 for fr in fl:
                     s.add(fl.linkrev(fr))
 
-    return baseset([r for r in subset if r in s])
+    return subset & s
 
 def first(repo, subset, x):
     """``first(set, [n])``