diff -r 054ec0212718 -r 2642ce9be6ef mercurial/formatter.py
--- a/mercurial/formatter.py	Mon Sep 15 16:07:54 2014 -0400
+++ b/mercurial/formatter.py	Wed Sep 17 00:31:03 2014 +0900
@@ -16,7 +16,7 @@
         self._style = opts.get("style")
         self._template = opts.get("template")
         self._item = None
-    def __bool__(self):
+    def __nonzero__(self):
         '''return False if we're not doing real templating so we can
         skip extra work'''
         return True
@@ -51,7 +51,7 @@
     '''the default text output scheme'''
     def __init__(self, ui, topic, opts):
         baseformatter.__init__(self, ui, topic, opts)
-    def __bool__(self):
+    def __nonzero__(self):
         return False
     def startitem(self):
         pass