From: Walter Lewis via General Guile related discussions <guile-user@gnu.org>
To: guile-user@gnu.org
Subject: Breaking hygiene with syntax-rules?
Date: Thu, 10 Aug 2023 22:35:09 -0400 [thread overview]
Message-ID: <dada39cb-05ad-0770-be80-87597b215d16@mailbox.org> (raw)
Hi guile,
Consider this program:
(define-syntax unhygienic
(syntax-rules ()
((_ the-pair fetch)
(begin
(define the-head (car the-pair))
(define (fetch) the-head)))))
(unhygienic '(1) fetch1)
(unhygienic '(2) fetch2)
(fetch1)
;; => 2
It seems that the second call to unhygienic shadows the previous
definition of the-head. I expected syntax-rules to generate fresh names
for it each time.
Is this expected, and if so, is there any way to generate an internal
definition using syntax-rules? For my case, I was writing a macro to
generate SRFI-9 record definitions, but I noticed some of the getters
and setters which I intended to be private were shadowing each other.
Best,
Walter
next reply other threads:[~2023-08-11 2:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-11 2:35 Walter Lewis via General Guile related discussions [this message]
2023-08-11 5:07 ` Breaking hygiene with syntax-rules? Dr. Arne Babenhauserheide
2023-08-11 8:00 ` Jean Abou Samra
2023-08-11 8:33 ` Dr. Arne Babenhauserheide
2023-08-11 23:57 ` Jean Abou Samra
2023-08-12 5:57 ` Dr. Arne Babenhauserheide
2023-08-11 13:34 ` Walter Lewis via General Guile related discussions
2023-08-11 22:50 ` Walter Lewis via General Guile related discussions
2023-08-11 23:55 ` Jean Abou Samra
2023-08-11 23:57 ` Jean Abou Samra
2023-08-12 0:19 ` Walter Lewis
2023-08-12 0:58 ` Jean Abou Samra
2023-08-12 5:59 ` Dr. Arne Babenhauserheide
2023-08-14 19:26 ` Thompson, David
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