From: "Maciek Godek" <pstrychuj@gmail.com>
To: guile-user@gnu.org
Subject: Me no understand scoping
Date: Tue, 29 Jul 2008 23:18:05 +0200 [thread overview]
Message-ID: <e2ceda030807291418w9901e5bud173fd11d4788b8@mail.gmail.com> (raw)
Hi,
consider the following code (simple iteration
construct invented mainly to cause naming
conflict, as the function 'times' is already
defined in guile)
(define-macro (times n f)
`(let ((env (the-environment)))
(let loop ((i 0))
(if (< i ,n)
(begin
(local-eval ,f env)
(loop (1+ i))
)
)
)
)
)
the whole thing with env was made as
a workaround disallowing f to see the
i variable defined in the macro (and to
perhaps see the value that otherwise
would be shadowed)
however,
(times 20 (display i))
yields
012345678910111213141516171819
Why?
--
Regards
M.
next reply other threads:[~2008-07-29 21:18 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-29 21:18 Maciek Godek [this message]
2008-07-30 3:24 ` Me no understand scoping Clinton Ebadi
2008-07-30 8:42 ` Maciek Godek
2008-07-30 14:03 ` Jon Wilson
2008-07-30 15:04 ` Klaus Schilling
2008-07-30 19:24 ` Maciek Godek
2008-07-31 7:20 ` Neil Jerram
2008-07-31 19:21 ` Maciek Godek
2008-07-31 21:37 ` Neil Jerram
2008-07-31 23:07 ` Maciek Godek
2008-08-02 17:43 ` Neil Jerram
2008-08-02 21:36 ` Maciek Godek
2008-08-08 20:54 ` Neil Jerram
2008-08-10 21:49 ` Maciek Godek
2008-08-09 11:05 ` Andy Wingo
2008-08-10 22:30 ` Maciek Godek
2008-09-11 14:56 ` JonWilson
2008-07-31 23:48 ` Clinton Ebadi
2008-08-01 22:00 ` Maciek Godek
2008-08-02 5:13 ` Jon Wilson
2008-08-02 21:35 ` Maciek Godek
[not found] <cmu-lmtpd-29005-1217434291-0@mail-imap1.uio.no>
2008-07-30 16:18 ` Kjetil S. Matheussen
2008-07-30 19:03 ` Clinton Ebadi
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