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ilya-klyuchnikov/rectypes.rkt

Created March 27, 2021 09:08
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rectypes.rkt
#lang typed/racket
(define-type
(MyRec a)
(U a (Pair 'rec (MyRec a))))
(: unwrap (-> (MyRec (MyRec Symbol)) (MyRec Symbol)))
(define (unwrap my_rec)
(match my_rec [(cons 'rec elem) elem]))
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