mirror of
https://github.com/ashinn/chibi-scheme.git
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bd32131b9d
other version numbers than 7 to `scheme-report-environment`, providing initial (scheme base) library.
38 lines
1 KiB
Scheme
38 lines
1 KiB
Scheme
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(define-syntax define-values
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(syntax-rules ()
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((define-values () expr)
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(define dummy
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(call-with-values (lambda () expr)
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(lambda args #f))))
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((define-values (var) expr)
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(define var expr))
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((define-values (var0 var1 ... varn) expr)
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(begin
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(define var0
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(call-with-values (lambda () expr) list))
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(define var1
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(let ((v (cadr var0)))
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(set-cdr! var0 (cddr var0))
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v))
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...
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(define varn
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(let ((v (cadr var0)))
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(set! var0 (car var0))
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v))))
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((define-values (var0 var1 ... . var-dot) expr)
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(begin
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(define var0
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(call-with-values (lambda () expr) list))
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(define var1
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(let ((v (cadr var0)))
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(set-cdr! var0 (cddr var0))
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v))
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...
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(define var-dot
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(let ((v (cdr var0)))
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(set! var0 (car var0))
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v))))
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((define-values var expr)
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(define var
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(call-with-values (lambda () expr) list)))))
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