--- a/tests/test-merge2.t Fri Jan 24 16:05:11 2020 -0800
+++ b/tests/test-merge2.t Fri Jan 24 17:49:21 2020 -0800
@@ -50,4 +50,8 @@
adding b
created new head
+ $ hg merge 'wdir()'
+ abort: merging with the working copy has no effect
+ [255]
+
$ cd ..