mercurial/ui.py

--- a/mercurial/ui.py	Wed May 31 10:35:10 2017 -0700
+++ b/mercurial/ui.py	Sun Jan 18 18:04:44 2015 +0900
@@ -263,7 +263,7 @@
                 (util.timer() - starttime) * 1000
 
     def formatter(self, topic, opts):
-        return formatter.formatter(self, topic, opts)
+        return formatter.formatter(self, self, topic, opts)
 
     def _trusted(self, fp, f):
         st = util.fstat(fp)