diff -r e95ec38f86b0 -r 9724f8f8850b mercurial/obsolete.py
--- a/mercurial/obsolete.py	Wed Aug 15 22:39:18 2012 +0200
+++ b/mercurial/obsolete.py	Tue Aug 21 02:41:20 2012 +0200
@@ -55,10 +55,6 @@
 import util, base85
 from i18n import _
 
-# the obsolete feature is not mature enought to be enabled by default.
-# you have to rely on third party extension extension to enable this.
-_enabled = False
-
 _pack = struct.pack
 _unpack = struct.unpack