push: backout 2bc520bd0ce0 due to test failures

mercurial/discovery.py

@@ -268,6 +268,7 b' def checkheads(repo, remote, outgoing, r'
     # If there are more heads after the push than before, a suitable
     # error message, depending on unsynced status, is displayed.
     error = None
+    unsynced = False
     allmissing = set(outgoing.missing)
     allfuturecommon = set(c.node() for c in repo.set('%ld', outgoing.common))
     allfuturecommon.update(allmissing)
@@ -311,15 +312,8 b' def checkheads(repo, remote, outgoing, r'
                         newhs.add(nh)
         else:
             newhs = candidate_newhs
-        unsynced = sorted(h for h in unsyncedheads if h not in discardedheads)
-        if unsynced:
-            heads = ' '.join(short(h) for h in unsynced)
-            if branch is None:
-                repo.ui.warn(_("remote has heads that are not known locally: "
-                               "%s\n") % heads)
-            else:
-                repo.ui.warn(_("remote has heads on branch '%s' that are "
-                               "not known locally: %s\n") % (branch, heads))
+        if [h for h in unsyncedheads if h not in discardedheads]:
+            unsynced = True
         if remoteheads is None:
             if len(newhs) > 1:
                 dhs = list(newhs)
@@ -356,3 +350,7 b' def checkheads(repo, remote, outgoing, r'
                 repo.ui.note((" %s\n") % short(h))
     if error:
         raise util.Abort(error, hint=hint)
+
+    # 6. Check for unsynced changes on involved branches.
+    if unsynced:
+        repo.ui.warn(_("note: unsynced remote changes!\n"))

tests/test-ssh.t

@@ -223,7 +223,7 b' push should succeed even though it has a'
   $ hg push
   pushing to ssh://user@dummy/remote
   searching for changes
-  remote has heads on branch 'default' that are not known locally: 6c0482d977a3
+  note: unsynced remote changes!
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes