diff -r 3f45488d70df -r d54a7410307f mercurial/templater.py
--- a/mercurial/templater.py	Wed Apr 06 20:34:34 2016 +0000
+++ b/mercurial/templater.py	Sun Apr 03 11:23:31 2016 +0900
@@ -956,7 +956,6 @@
             defaults = {}
         if cache is None:
             cache = {}
-        self.mapfile = mapfile or 'template'
         self.cache = cache.copy()
         self.map = {}
         if mapfile: