[racket] Language Toolkit Questions

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Wed Jul 20 07:50:09 EDT 2011

Do you perhaps want prop:procedure?


On Tue, Jul 19, 2011 at 6:08 PM, Pavel Panchekha <pavpanchekha at gmail.com> wrote:
> 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
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