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Info-Mac 1992 August
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Lazy-Scheme
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Divers
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Stepper
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1992-03-05
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281b
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15 lines
{A simple stepper relying on stepin and stepout hooks}
(let [(c 0)]
(define (stepin f e)
(=! c (1+ c))
(prin c) (prin " -> ")
(prin f) (prin " in ")
(print (envar e)) (pause) c))
(define (stepout c v)
(prin c)
(prin " <- ")
(printdebug v)(pause))