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beautiful-racket/beautiful-racket-lib/br/conditional.rkt

15 lines
290 B
Racket

9 years ago
#lang racket/base
(require (for-syntax racket/base))
(provide (all-defined-out))
(define-syntax-rule (until cond expr ...)
(let loop ()
(unless cond
expr ...
(loop))))
(define-syntax-rule (while cond expr ...)
(let loop ()
(when cond
expr ...
(loop))))