# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 1410976809 25200
# Node ID bbf4f3dfd700256f186315d2996b74fe1ccae370
# Parent  8040a44aab1cecec36a3fb33a3a21871a98fc47f
revset: use `subset &` in `rev`

This takes advantage of the `fullreposet` smartness and yields a nice
speedup.

revset #0: rev(25)
0) wall 0.005480 comb 0.000000 user 0.000000 sys 0.000000 (best of 305)
1) wall 0.000052 comb 0.000000 user 0.000000 sys 0.000000 (best of 21891)

diff -r 8040a44aab1c -r bbf4f3dfd700 mercurial/revset.py
--- a/mercurial/revset.py	Wed Sep 17 19:52:34 2014 -0700
+++ b/mercurial/revset.py	Wed Sep 17 11:00:09 2014 -0700
@@ -1346,7 +1346,7 @@
     except (TypeError, ValueError):
         # i18n: "rev" is a keyword
         raise error.ParseError(_("rev expects a number"))
-    return subset.filter(lambda r: r == l)
+    return subset & baseset([l])
 
 def matching(repo, subset, x):
     """``matching(revision [, field])``