diff -r b4ffdeb2afd8 -r c06301c5b3e2 tests/test-topic-stack.t
--- a/tests/test-topic-stack.t	Tue Nov 27 04:07:36 2018 +0100
+++ b/tests/test-topic-stack.t	Fri Dec 21 20:14:23 2018 +0100
@@ -320,11 +320,11 @@
   5 default {foo} draft c_f
 
   $ hg log -r 'stack(foo)'
-  hg: parse error: stack() takes no argument, it works on current topic
+  hg: parse error: stack takes no arguments, it works on current topic
   [255]
 
   $ hg log -r 'stack(foobar)'
-  hg: parse error: stack() takes no argument, it works on current topic
+  hg: parse error: stack takes no arguments, it works on current topic
   [255]
 
 Case with multiple heads on the topic