--- a/tests/test-revset.t	Mon Apr 10 16:50:23 2017 +0200
+++ b/tests/test-revset.t	Sat Apr 08 20:07:37 2017 +0900
@@ -454,7 +454,7 @@
   0
 
   $ log 'extra(branch, a, b)'
-  hg: parse error: extra takes at most 2 arguments
+  hg: parse error: extra takes at most 2 positional arguments
   [255]
   $ log 'extra(a, label=b)'
   hg: parse error: extra got multiple values for keyword argument 'label'