[racket] redefining primitives?

From: Sam Tobin-Hochstadt (samth at ccs.neu.edu)
Date: Tue Jan 18 11:04:32 EST 2011

(composed in my mail buffer, so it might not compile)

#lang racket/load

(module student racket
  (require lang/htdp-intermediate)
  (define (my+ x y) (+ x y))
  (provide (rename-out [my+ +])
              (except-out (all-from-out lang/htdp-intermediate) + list)))

(module test 'student
  ;; both of these will error
  (+ 1 2 4)

For more information, see:

On Tue, Jan 18, 2011 at 10:57 AM, Todd O'Bryan <toddobryan at gmail.com> wrote:
> Is it possible to redefine primitives, like +, and then provide them
> to another module?
> If so, can you also undefine primitives? Like if I wanted to make a
> student language where + only accepted two arguments and the list
> function was unavailable, how could I do that?
> Todd
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sam th
samth at ccs.neu.edu

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