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Mike Sperber wrote: > You mean in a global hash table? That's a hack around the lack of a > field in the syntax objects. But necessary if you want the generic car/cdr to be efficient, which is a more important constraint. With this representation, you can use the primitive car/cdr unmodified on syntax objects. > To make it work efficiently, you'd have > to bring weakness in---a lot of machinery to duplicate functionality > that would trivially work if syntax objects were abstract and thus > extensible. I would differ on "trivially" ;-) Reading through the psyntax implementation, I think complexity would be pretty much conserved no matter how you do it. Cheers Andre