# HG changeset patch
# User Lucas Moscovicz <lmoscovicz@fb.com>
# Date 2014-02-20 18:15:38
# Node ID 0e99a66eb7bcdb857c0079001df2039d79755782
# Parent  efae655fd3635fec9e1730528a5fd5f220262652

revset: added __nonzero__ method to lazyset

Now it doesn't have to go through all the set and can return lazily as soon as
it finds one element.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2155,6 +2155,11 @@ class lazyset(object):
         l = baseset([r for r in self])
         return l + baseset(x)
 
+    def __nonzero__(self):
+        for r in self:
+            return True
+        return False
+
     def __len__(self):
         # Basic implementation to be changed in future patches.
         l = baseset([r for r in self])