diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -30,6 +30,9 @@ from . import (
     util,
 )
 
+class TemplateNotFound(error.Abort):
+    pass
+
 # template parsing
 
 elements = {
@@ -1465,9 +1468,6 @@ def _readmapfile(mapfile):
     aliases.extend(conf['templatealias'].items())
     return cache, tmap, aliases
 
-class TemplateNotFound(error.Abort):
-    pass
-
 class templater(object):
 
     def __init__(self, filters=None, defaults=None, resources=None,