--- a/tests/test-merge-closedheads.t	Tue Oct 08 10:40:36 2019 -0700
+++ b/tests/test-merge-closedheads.t	Tue Oct 08 19:35:30 2019 -0700
@@ -43,7 +43,7 @@
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg merge
   abort: branch 'default' has 3 heads - please merge with an explicit rev
-  (run 'hg heads .' to see heads)
+  (run 'hg heads .' to see heads, specify rev with -r)
   [255]
 
 close one of the heads