diff -r 5cc7905bccc9 -r 1ffeeb91c55d mercurial/ancestor.py
--- a/mercurial/ancestor.py	Tue May 31 20:39:04 2011 -0500
+++ b/mercurial/ancestor.py	Wed Jun 01 12:38:46 2011 +0200
@@ -76,7 +76,7 @@
     # increment each ancestor list until it is closer to root than
     # the other, or they match
     try:
-        while 1:
+        while True:
             if gx[0] == gy[0]:
                 for v in gx[1]:
                     if v in gy[1]: