[plt-dev] abstract methods

Everyone adds this syntax rule to OO Racket programs:

> (define-syntax-rule
>   (define/abstract (x y ...))
>   (define/public (x y ...) (error 'x "abstract method needs to be  
> instantiated")))

Could some kind current maintainer of class.ss add this rule and add  
the proper syntax magic?

Thanks -- Matthias