Program

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Real implementations of delay.

Lecture 5 - slide 21 : 26
Program 2

; R5RS syntactic abstraction:
(define-syntax my-delay 
  (syntax-rules ()
    ((delay expr)
     (lambda ()
        expr))))

; MzScheme syntactic abstraction:
(define-macro my-delay
  (lambda (expr)
    `(lambda () ,expr)))