Date: Sat, 10 Jul 2010 20:45:29 +0000
From: Taylor R Campbell <[email protected]>
What should I do if I want to preclude only multiple uses of the
continuation, but still allow single uses even if they are non-local?
Sorry, should've spent half a minute thinking about that before making
my message even longer by asking it.
(define (guarantee-single-return procedure)
(let ((returned? #f))
(begin0 (procedure)
(if returned? (error "Multiple return prohibited."))
(set! returned? #t))))
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