diff -r 7f7425306925 -r 3b4e00cba57a mercurial/node.py
--- a/mercurial/node.py	Sat Oct 28 23:37:59 2006 -0300
+++ b/mercurial/node.py	Sun Oct 29 10:53:51 2006 +0100
@@ -10,6 +10,7 @@
 from demandload import demandload
 demandload(globals(), "binascii")
 
+nullrev = -1
 nullid = "\0" * 20
 
 def hex(node):