I'm trying to port some code from MIT Scheme to Racket. A large part of the MIT Scheme was a metacircular interpreter, and I'm hoping that I can use Racket's language definition capabilities to avoid that annoyance.
But I've hit a snag. One of the important parts of the MIT Scheme wrapped all objects in another structure. It then distinguished between primitive functions, for which we would have to unwrap that structure and use a fallback, and functions defined in the guest Scheme, which expected wrapped objects and so we could use a smarter apply function. In Racket, I can override =%datum=, =lambda=, and similar, to produce these wrapped objects. But I can't figure out what to do with =%app=. If there was some primitive for "defined outside this language", I could use that. Or if there was a way of explicitly "tagging" objects (some sort of transparent metadata, as has e.g. Clojure), I could tag all of my non-primitive functions and use that. Do you know if anything like either of these options exist? Or is there some clearer way in Racket to express what I want to do? -- Pavel Panchekha _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
