--- a/tests/test-obsolete.t	Tue Jan 16 14:08:54 2018 +0100
+++ b/tests/test-obsolete.t	Tue Jan 16 14:28:57 2018 +0100
@@ -1352,6 +1352,7 @@
   $ hg commit --amend -m "message"
   $ hg book bookb -r 13bedc178fce --hidden
   bookmarking hidden changeset 13bedc178fce
+  (hidden revision '13bedc178fce' was rewritten as: a9b1f8652753)
   $ hg log -r 13bedc178fce
   4:13bedc178fce (draft *obsolete*) [ bookb] add b [rewritten using amend as 5:a9b1f8652753]
   $ hg book -d bookb