# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 1411841890 18000
# Node ID c425b22a7ca56e15b63415730862776b72f07153
# Parent  e6e7ef68c879b55c1b2c0ebe00d8cbdbc929dbed# Parent  300e07582e9b9eda73f0d0456ca2f4b3c0dc2f8c
merge with stable

diff -r e6e7ef68c879 -r c425b22a7ca5 mercurial/revset.py
--- a/mercurial/revset.py	Mon Sep 22 16:14:08 2014 -0500
+++ b/mercurial/revset.py	Sat Sep 27 13:18:10 2014 -0500
@@ -2228,6 +2228,10 @@
             self._set = set(self)
         return self._set
 
+    @util.propertycache
+    def __contains__(self):
+        return self.set().__contains__
+
     def __sub__(self, other):
         """Returns a new object with the substraction of the two collections.