[racket-users] Calling into a Chez Scheme library -- imported symbol rewritten in vm-eval?

I have a Chez Scheme library "foo.ss": (library (foo) (export bar) (import (rnrs)) (define (bar) "hello")) >From Chez Scheme: $ chezscheme Chez Scheme Version 9.5.4 Copyright 1984-2020 Cisco Systems, Inc. > (eval '((lambda () (import (foo)) (bar "hello" A Racket program "call.r

[racket] what is the purpose of installing a handler for the default continuation prompt in racket/load?

In collects/racket/load.rkt, strip-context-and-eval installs a handler for the default continuation prompt with call-with-continuation-prompt... and then the handler simply calls abort-current-continuation with the default continuation prompt again. To my uneducated eye, this looks like a no-op: i

[racket-users] What algorithm does Racket use to test cyclical data structures for equality?

The Racket documentation for equal? says equality is recursively defined; if both v1 and v2 contain reference > cycles, they are equal when the infinite unfoldings of the values would be > equal. I didn't quite believe my ears! :-) So I tried it with two pairs (a b...) and four pairs (a b

[racket-users] How to eval a custom language from inside a module?

Suppose I've defined a simple language: ; example.rkt #lang racket (provide foo) (define-syntax foo (syntax-rules () ((foo) (printf "foo!~n" Now I want to create an eval-example function which will evaluate forms in my language: > (eval-example '(foo)) foo! If I'm working

Re: [racket-users] How to eval a custom language from inside a module?

> > (define-runtime-path example "example.rkt") That works! Thanks! -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com

[racket-users] Is there a way to eval a custom language from inside a module... without instantiating modules multiple times?

I'd like to be able to eval a custom language from inside a module... without instantiating modules multiple times. With the help of Matthew Butterick, I've gotten this far: ; runtime.rkt #lang racket (printf "This is runtime.rkt~n") ; example.rkt #lang racket (require "runtime.rkt") (pr

Re: [racket-users] Is there a way to eval a custom language from inside a module... without instantiating modules multiple times?

> > 2. Just use the same namespace as eval-example.rkt > I had tried this, but it evals not just the example language but Racket+example (i.e. Racket forms also eval, and the example language has to be compatible with Racket). 1. Keep the new namespace, but use namespace-attach-module to att