--- a/hgext/purge.py	Sat May 13 17:53:55 2017 +0900
+++ b/hgext/purge.py	Sat Jan 09 23:07:20 2016 +0900
@@ -29,15 +29,15 @@
 
 from mercurial.i18n import _
 from mercurial import (
-    cmdutil,
     commands,
     error,
+    registrar,
     scmutil,
     util,
 )
 
 cmdtable = {}
-command = cmdutil.command(cmdtable)
+command = registrar.command(cmdtable)
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or