No, but the Racket OO system is based on BETA's implementation of OO, and Racket has some actual users. There's definitely some interesting ideas there. For ex

No, but the Racket OO system is based on BETA's implementation of OO, and Racket has some actual users. There's definitely some interesting ideas there. For example, `inner` being the opposite of super (e.g. call the subclasses implementation of this method). Some others, but I'm not sure I remember them (Augmentation?).