diff -r 72642a6970e0 -r 56d4c6207ef9 hgext/obsolete.py
--- a/hgext/obsolete.py	Wed Jul 11 13:38:48 2012 +0200
+++ b/hgext/obsolete.py	Wed Jul 11 13:59:02 2012 +0200
@@ -414,9 +414,13 @@
 
     templatekw.keywords['obsolete'] = obsoletekw
 
+    # warning about more obsolete
+    for cmd in ['commit', 'push', 'pull', 'graft', 'phase', 'unbundle']:
+        entry = extensions.wrapcommand(commands.table, cmd, warnobserrors)
     try:
         rebase = extensions.find('rebase')
         if rebase:
+            entry = extensions.wrapcommand(rebase.cmdtable, 'rebase', warnobserrors)
             extensions.wrapfunction(rebase, 'buildstate', buildstate)
             extensions.wrapfunction(rebase, 'defineparents', defineparents)
             extensions.wrapfunction(rebase, 'concludenode', concludenode)
@@ -691,6 +695,28 @@
         ui.warn(_('Working directory parent is obsolete\n'))
     return res
 
+def warnobserrors(orig, ui, repo, *args, **kwargs):
+    """display warning is the command resulted in more instable changeset"""
+    priorunstables = len(repo.revs('unstable()'))
+    priorlatecomers = len(repo.revs('latecomer()'))
+    priorconflictings = len(repo.revs('conflicting()'))
+    #print orig, priorunstables
+    #print len(repo.revs('secret() - obsolete()'))
+    try:
+        return orig(ui, repo, *args, **kwargs)
+    finally:
+        newunstables = len(repo.revs('unstable()')) - priorunstables
+        newlatecomers = len(repo.revs('latecomer()')) - priorlatecomers
+        newconflictings = len(repo.revs('conflicting()')) - priorconflictings
+        #print orig, newunstables
+        #print len(repo.revs('secret() - obsolete()'))
+        if newunstables > 0:
+            ui.warn(_('%i new unstables changesets\n') % newunstables)
+        if newlatecomers > 0:
+            ui.warn(_('%i new latecomers changesets\n') % newlatecomers)
+        if newconflictings > 0:
+            ui.warn(_('%i new conflictings changesets\n') % newconflictings)
+
 def noextinctsvisibleheads(orig, repo):
     repo._turn_extinct_secret()
     return orig(repo)