12 lines
292 B
Racket
12 lines
292 B
Racket
#lang racket
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(provide aif it)
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(require anaphoric/it
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racket/stxparam)
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(define-syntax-rule (aif condition true-branch false-branch)
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(let ([tmp condition])
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(if tmp
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(syntax-parameterize ([it (make-rename-transformer #'tmp)])
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true-branch)
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false-branch))) |