tests/test-revset2.t

--- a/tests/test-revset2.t	Mon Apr 02 09:06:24 2018 -0700
+++ b/tests/test-revset2.t	Mon Apr 02 09:16:52 2018 -0700
@@ -581,7 +581,8 @@
   hg: parse error: empty query
   [255]
   $ log 'parents("")'
-  8
+  hg: parse error: empty string is not a valid revision
+  [255]
 
 we can use patterns when searching for tags