On Sep 11, 2009, at 10:31 AM, Arthur A. Gleckler wrote:
> MIT Scheme supports syntax-rules, syntactic closures, and an explicit
> renaming system, all of which are hygienic macro systems.
MIT Scheme's implementation of hygiene is broken:
1 ]=> (define-syntax a
(syntax-rules ()
((_)
(begin
(define-syntax b
(syntax-rules ()
((_) 1)))
(define-syntax c
(syntax-rules ()
((_) 2)))))))
;Value: a
1 ]=> (a)
;Unspecified return value
1 ]=> (b)
;Value: 1
--
Brian Mastenbrook
[email protected]
http://brian.mastenbrook.net/
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