What's wrong with this MySQL Stored Function?

Having trouble getting this to apply in MySQL Workbench 5.2.15

DELIMITER //

CREATE 
    DEFINER=`potts`@`%` 
    FUNCTION 
        `potts`.`fn_create_category_test`  (test_arg VARCHAR(50))
    RETURNS int

BEGIN

    DECLARE new_id int;
    SET new_id = 8;
    RETU开发者_开发问答RN new_id;

END//

The actual function will have a lot more between BEGIN and END but as it stands, even this 3 liner won't work.

Thanks!

DELIMITER $$

CREATE FUNCTION `fn_create_category_test` (test_arg varchar(50))
   RETURNS INT
BEGIN

DECLARE new_id int;
set new_id=8;
return new_id;
END $$

DELIMITER ;

Works fine for me, try getting rid of DEFINER?