--- a/mercurial/revlog.py Mon Nov 08 01:41:42 2010 +0100+++ b/mercurial/revlog.py Sun Nov 07 18:16:07 2010 +0900@@ -869,6 +869,8 @@ return c def descendant(self, start, end):+ if start == nullrev:+ return True for i in self.descendants(start): if i == end: return True