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  1. ; parallel assignment
  2.  
  3. (define-syntax pset!
  4.   (syntax-rules ()
  5.     [(_ [x e] ...)
  6.      (for-each
  7.        (lambda (f v) (f v))
  8.        (list (lambda (t) (set! x t)) ...)
  9.        (list e ...))]))
  10.  
  11. (define a 1) (define b 2) (define c 3)
  12. (display (list a b c)) (newline)
  13. (pset! (a b) (b c) (c a))
  14. (display (list a b c)) (newline)
Success #stdin #stdout 0.01s 50288KB
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Standard input is empty
stdout
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(1 2 3)
(2 3 1)
https://ideone.com/jO200s
language:
Scheme (guile 2.2.4)
created:
5 years ago
visibility:
public

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