--- a/tests/test-diffdir.t Thu Sep 16 16:12:26 2010 -0500
+++ b/tests/test-diffdir.t Thu Sep 16 17:51:32 2010 -0500
@@ -34,7 +34,9 @@
$ hg diff -r ""
abort: 00changelog.i@: ambiguous identifier!
+ [255]
$ hg diff -r tip -r ""
abort: 00changelog.i@: ambiguous identifier!
+ [255]
$ true