--- a/tests/test-command-template.t	Fri Mar 07 14:06:52 2014 -0500
+++ b/tests/test-command-template.t	Thu Mar 27 17:21:27 2014 -0500
@@ -1416,6 +1416,12 @@
   abort: template filter 'datefilter' is not compatible with keyword 'author'
   [255]
 
+Thrown an error if a template function doesn't exist
+
+  $ hg tip --template '{foo()}\n'
+  hg: parse error: unknown function 'foo'
+  [255]
+
   $ cd ..