From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: Matthew Flatt <mflatt@cs.utah.edu>,
"dev@racket-lang.org" <dev@racket-lang.org>,
Eli Barzilay <eli@barzilay.org>,
guile-devel@gnu.org
Subject: Re: [racket-dev] Enhancement to the syntax system?
Date: Tue, 10 Jul 2012 17:44:47 +0200 [thread overview]
Message-ID: <CAGua6m1_7MNKP0FL3EcNLxKFV8Ltph+xt25o5p+FTB76k-Lz3A@mail.gmail.com> (raw)
In-Reply-To: <87a9z7tz6n.fsf@gnu.org>
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samth made a pointer to
http://srfi.schemers.org/srfi-72/srfi-72.html
It does not look like guile racket etc. have implemented this yet.
Am I wrong?
This is precisely what I'm after!
On Tue, Jul 10, 2012 at 5:26 PM, Ludovic Courtès <ludo@gnu.org> wrote:
> Hi,
>
> Matthew Flatt <mflatt@cs.utah.edu> skribis:
>
> > It's natural --- but not correct --- to think that #` is responsible
> > for hygiene, in which case `(f #'x)' should keep the given `x' separate
> > from the `let'-bound `x' in the result.
>
> [...]
>
> > If you change the example to
> >
> > #lang racket
> > (begin-for-syntax
> > (define-syntax-rule (f body)
> > #`(let ([x 1]) body)))
> > (define-syntax (m stx)
> > (with-syntax ([zz (f x)]) #`(let ([x 2]) zz)))
> > (m)
> >
> > so that `f' is used as a macro instead of a function, then you get 2,
> > since the macro-expansion of `(f x)' keeps the `x's separate.
>
> Interesting. Thanks for the clarification and examples.
>
> Ludo’.
>
>
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next prev parent reply other threads:[~2012-07-10 15:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-30 15:22 Enhancement to the syntax system? Stefan Israelsson Tampe
2012-07-02 19:28 ` Ludovic Courtès
2012-07-02 20:43 ` Stefan Israelsson Tampe
2012-07-02 22:41 ` Ludovic Courtès
2012-07-03 14:37 ` Stefan Israelsson Tampe
2012-07-03 21:33 ` Ludovic Courtès
2012-07-03 21:52 ` Stefan Israelsson Tampe
2012-07-04 7:47 ` Marijn
2012-07-04 8:04 ` Stefan Israelsson Tampe
2012-07-09 15:52 ` Ludovic Courtès
2012-07-09 17:40 ` Stefan Israelsson Tampe
2012-07-10 8:24 ` Ludovic Courtès
2012-07-10 13:35 ` Stefan Israelsson Tampe
2012-07-10 14:34 ` Marijn
2012-07-10 14:51 ` [racket-dev] " Eli Barzilay
[not found] ` <20476.16781.257276.194149-a5nvgYPMCZcx/1z6v04GWfZ8FUJU4vz8@public.gmane.org>
2012-07-10 15:03 ` Matthew Flatt
2012-07-10 15:26 ` [racket-dev] " Ludovic Courtès
2012-07-10 15:44 ` Stefan Israelsson Tampe [this message]
2012-07-10 17:47 ` Stefan Israelsson Tampe
2012-07-10 16:48 ` Eli Barzilay
2014-05-03 21:29 ` Marijn Schouten (hkBst)
2012-07-10 15:44 ` Ryan Culpepper
2012-07-10 15:22 ` Ludovic Courtès
2012-07-10 7:36 ` Stefan Israelsson Tampe
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