--- a/mercurial/localrepo.py	Mon Dec 06 16:56:06 2010 +0100
+++ b/mercurial/localrepo.py	Thu Dec 02 03:43:06 2010 +0100
@@ -733,7 +733,7 @@
         self._branchcachetip = None
 
     def invalidate(self):
-        for a in "changelog manifest".split():
+        for a in ("changelog", "manifest"):
             if a in self.__dict__:
                 delattr(self, a)
         self.invalidatecaches()