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Merge pull request #438 from arthurmaciel/unless-when

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Unless/when don't have alternate clause
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Justin Ethier 2021-01-22 22:17:31 -05:00 • committed by GitHub
commit f8b2d5a9cc
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1 changed files with 2 additions and 4 deletions
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6
scheme/base.sld
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@ -483,15 +483,13 @@
(if (null? (cdr exp)) (error/loc "empty when" exp))
(if (null? (cddr exp)) (error/loc "no when body" exp))
`(if ,(cadr exp)
((lambda () ,@(cddr exp)))
#f))))
((lambda () ,@(cddr exp)))))))
(define-syntax unless
(er-macro-transformer
(lambda (exp rename compare)
(if (null? (cdr exp)) (error/loc "empty unless" exp))
(if (null? (cddr exp)) (error/loc "no unless body" exp))
`(if ,(cadr exp)
#f
`(if (not ,(cadr exp))
((lambda () ,@(cddr exp)))))))
(define-syntax do
(er-macro-transformer