diff -r 01dc8ba3e032 -r 42ecd56399d7 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Mon Sep 13 13:09:24 2010 +0200
+++ b/mercurial/subrepo.py	Mon Sep 13 13:09:26 2010 +0200
@@ -264,6 +264,9 @@
     def diff(self, diffopts, node2, match, prefix, **opts):
         pass
 
+    def outgoing(self, ui, dest, opts):
+        return 1
+
 class hgsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
         self._path = path
@@ -394,6 +397,9 @@
         other = hg.repository(self._repo.ui, dsturl)
         return self._repo.push(other, force)
 
+    def outgoing(self, ui, dest, opts):
+        return hg.outgoing(ui, self._repo, _abssource(self._repo, True), opts)
+
 class svnsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
         self._path = path