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A library for set!-ing numbers. You shouldn't use this.
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#lang racket/base | |
(require | |
(for-syntax | |
racket/base | |
syntax/parse) | |
(rename-in | |
racket/base | |
[#%datum old-datum] | |
[set! old-set!])) | |
(define number-map (make-hasheq)) | |
(define-syntax (set! stx) | |
(syntax-parse stx | |
[(_ i:number v) | |
#'(hash-set! number-map i v)] | |
[(_ . stx) #'(old-set! . stx)])) | |
(define-syntax (#%datum stx) | |
(syntax-parse stx | |
[(_ . i:number) | |
#'(hash-ref! number-map (old-datum . i) (old-datum . i))] | |
[stx #'(old-datum . stx)])) | |
(module+ test | |
(require rackunit) | |
(check-equal? 5 5) | |
(set! 5 6) | |
(check-equal? 5 6)) |
Should probably add support for reals by making that sequence lazy.
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Seems reasonable; added. Not sure how to get
for
to use this new interpretation of numbers as sequence by default, though...