Configure a Mapping Provider.
Do a contact search - and select several. Then select 'Map Contacts" from more actions. You'll get a warning and a fatal error:
warning: Invalid argument supplied for foreach() in /Users/dgg/svn/trunk/packages/HTML/QuickForm/Controller.php on line 488.
Database Error Code: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') AND civicrm_address.is_primary = 1' at line 18, 1064