--- a/tests/test-bookmarks.t	Wed Oct 24 23:09:31 2012 +0200
+++ b/tests/test-bookmarks.t	Tue Feb 05 16:22:53 2013 -0800
@@ -257,6 +257,12 @@
   abort: a bookmark cannot have the name of an existing branch
   [255]
 
+bookmark with integer name
+
+  $ hg bookmark 10
+  abort: a bookmark cannot have an integer as its name
+  [255]
+
 incompatible options
 
   $ hg bookmark -m Y -d Z