672910f27b
I started from tabs that are not on the beginning of lines, and in several places I did further cleanings. If you're worried about knowing who wrote some code, for example, if you get to this commit in "git blame", then note that you can use the "-w" flag in many git commands to ignore whitespaces. For example, to see per-line authors, use "git blame -w <file>". Another example: to see the (*much* smaller) non-whitespace changes in this (or any other) commit, use "git log -p -w -1 <sha1>".
45 lines
1.4 KiB
Racket
45 lines
1.4 KiB
Racket
#lang racket/load
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(module a racket/base
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(require racket/contract
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(only-in racket/list first second rest empty?)
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(prefix-in old: (only-in racket/list argmax)))
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(define (argmax f lov)
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(define r (old:argmax f lov))
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(if (and (pair? r) (eq? (cadr r) 'bananas))
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'(3 oranges)
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r)) ;; yet another bug
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(provide
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(contract-out
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[argmax
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(->i ([f (-> any/c real?)] [lov (and/c pair? list?)]) ()
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(r (f lov)
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(lambda (r)
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(define f@r (f r))
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(and (for/and ((v lov)) (>= f@r (f v)))
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(eq? (first (memf (lambda (v) (= (f v) f@r)) lov))
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r)))))])))
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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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;; --- copied from version 1 ---
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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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;; --- copies from version 2 ---
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(printf "4: ~s\n" (argmax sqrt '(1)))
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(printf "5: ~s\n" (argmax car '((3 apples) (3 oranges))))
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;; --- new tests ---
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(with-handlers ([exn:fail:contract:blame? void])
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(printf "***6: ~s\n" (argmax car '((3 bananas) (3 oranges))))))
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(require 'b)
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