mercurial/commands.py

--- a/mercurial/commands.py	Tue Jan 22 03:23:02 2013 +0100
+++ b/mercurial/commands.py	Tue Jan 22 11:39:14 2013 +0100
@@ -5866,7 +5866,7 @@
     Returns 0 on success.
     """
     displayer = cmdutil.show_changeset(ui, repo, opts)
-    displayer.show(repo[len(repo) - 1])
+    displayer.show(repo['tip'])
     displayer.close()
 
 @command('unbundle',