diff -r 8413916df816 -r 774da7121fc9 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Aug 24 05:42:41 2011 -0400
+++ b/mercurial/localrepo.py	Thu Aug 25 20:21:04 2011 -0400
@@ -521,7 +521,7 @@
             for label, nodes in branches.iteritems():
                 for node in nodes:
                     f.write("%s %s\n" % (hex(node), encoding.fromlocal(label)))
-            f.rename()
+            f.close()
         except (IOError, OSError):
             pass