diff -r ba2520dd1e29 -r 2eab5025f804 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Jul 16 14:48:52 2010 +0200
+++ b/mercurial/localrepo.py	Fri Jul 16 18:35:15 2010 +0200
@@ -1313,7 +1313,6 @@
         for n in bases:
             knownheads.update(cl.parents(n))
         knownheads.discard(nullid)
-        knownheads = list(knownheads)
         if knownheads:
             # Now that we know what heads are known, we can compute which
             # changesets are known.  The recipient must know about all