--- a/mercurial/dirstate.py	Fri Apr 16 22:14:14 2010 +0200
+++ b/mercurial/dirstate.py	Fri Apr 16 19:18:20 2010 +0200
@@ -11,7 +11,6 @@
 import struct, os, stat, errno
 import cStringIO
 
-_unknown = ('?', 0, 0, 0)
 _format = ">cllll"
 propertycache = util.propertycache