# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2015-05-18 00:58:39
# Node ID 81a395447b345dd8dd7cd002e99e66c8eaa18d53
# Parent  91c49621b2b80c8e145514c67e2dfc163ddb4da6

revset: use 'next()' to detect end of iteration in 'limit'

The 'next()' built-in can return a default value, allow to get rid of the
confusing try/except code flow.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -1145,12 +1145,11 @@ def limit(repo, subset, x):
     result = []
     it = iter(os)
     for x in xrange(lim):
-        try:
-            y = it.next()
-            if y in ss:
-                result.append(y)
-        except (StopIteration):
+        y = next(it, None)
+        if y is None:
             break
+        elif y in ss:
+            result.append(y)
     return baseset(result)
 
 def last(repo, subset, x):