Provide `promise?`. #6

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NoahStoryM wants to merge 1 commit into racket:master from NoahStoryM:promise

NoahStoryM commented Nov 15, 2022

With promise?, we can define more precise predicates for some data structures:

(define (stream? v)
  (or (null? v)
      (and (pair? v)
           (promise? (cdr v)))))


          Provide promise?.

66f4ecb

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