--- a/tests/test-mq-qnew.t	Tue Oct 06 21:06:18 2020 -0700
+++ b/tests/test-mq-qnew.t	Thu Oct 08 15:35:44 2020 -0700
@@ -256,7 +256,7 @@
   > def reposetup(ui, repo):
   >     class commitfailure(repo.__class__):
   >         def commit(self, *args, **kwargs):
-  >             raise error.Abort('emulating unexpected abort')
+  >             raise error.Abort(b'emulating unexpected abort')
   >     repo.__class__ = commitfailure
   > EOF
   $ cat >> .hg/hgrc <<EOF