--- a/mercurial/dirstate.py	Mon Mar 03 15:50:51 2014 +0900
+++ b/mercurial/dirstate.py	Mon Mar 03 15:50:41 2014 +0900
@@ -4,7 +4,6 @@
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
-import errno
 
 from node import nullid
 from i18n import _