24 lines
752 B
Racket
24 lines
752 B
Racket
#lang racket/load
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(module a racket/base
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(require racket/contract (only-in racket/list first second rest empty?) (prefix-in old: (only-in racket/list argmax)))
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(define (argmax f lov)
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(old:argmax f lov))
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(provide/contract
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[argmax (-> (-> any/c real?) (and/c pair? list?) any/c)]))
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(module b racket/base
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(require 'a)
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(require racket/contract/private/blame)
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(with-handlers ([exn:fail:contract:blame? void])
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(printf "***0: ~s\n" (argmax car '())))
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(with-handlers ([exn:fail:contract:blame? void])
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(printf "***1: ~s\n" (argmax car '())))
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(with-handlers ([exn:fail:contract:blame? void])
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(printf "***2: ~s\n" (argmax car '((apples 3)))))
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(printf "3: ~s\n" (argmax car '((3 apples) (3 oranges)))))
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(require 'b)
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