--- a/mercurial/revlog.py Sat May 12 16:00:53 2012 +0200
+++ b/mercurial/revlog.py Sat May 12 16:00:57 2012 +0200
@@ -1208,7 +1208,7 @@
continue
for p in (p1, p2):
- if not p in self.nodemap:
+ if p not in self.nodemap:
raise LookupError(p, self.indexfile,
_('unknown parent'))