diff -r 926c9ee8d4be -r cd956049fc14 mercurial/hg.py
--- a/mercurial/hg.py	Mon Jan 09 04:16:00 2012 +0100
+++ b/mercurial/hg.py	Mon Jan 09 03:47:16 2012 +0100
@@ -507,9 +507,9 @@
         revs = [repo.lookup(rev) for rev in revs]
 
     other = peer(repo, opts, dest)
-    common, outheads = discovery.findcommonoutgoing(repo, other, revs,
-                                                    force=opts.get('force'))
-    o = repo.changelog.findmissing(common, outheads)
+    outgoing = discovery.findcommonoutgoing(repo, other, revs,
+                                            force=opts.get('force'))
+    o = outgoing.missing
     if not o:
         ui.status(_("no changes found\n"))
         return None