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From: "Thompson, David" <dthompson2@worcester.edu>
To: Damien Mattei <damien.mattei@gmail.com>
Cc: guile-user <guile-user@gnu.org>
Subject: Re: syntax? in scheme/Guile
Date: Mon, 13 May 2024 19:42:54 -0400	[thread overview]
Message-ID: <CAJ=Rwfb=Kx93Ag0y5b6G=5pdynKBbJqXPswVcaL2Pz7t9JFBUg@mail.gmail.com> (raw)
In-Reply-To: <CADEOaddFAG11ZSAxUM2MEiWdcboz_5SGONE5H+BLrPrDRhAPaw@mail.gmail.com>

Hi Damien,

On Mon, May 13, 2024 at 4:43 AM Damien Mattei <damien.mattei@gmail.com> wrote:
>
> any idea for a predicate for syntax object in Guile/scheme like exist in
> Racket 'syntax?' ?

This predicate is in the (system syntax) module in Guile.

> - what is a wrapped syntax object?

Syntax objects are part of the syntax-case procedural macro system. A
syntax object wraps a value with things like lexical context and
source location (when available).

For example:

scheme@(guile-user)> (call-with-input-string "(1 2 3)" read-syntax)
$16 = #<syntax:unknown file:1:0 (#<syntax:unknown file:1:1 1>
#<syntax:unknown file:1:3 2> #<syntax:unknown file:1:5 3>)>

See 6.8.3 Support for the ‘syntax-case’ System in the manual.

Hope this helps,

- Dave



  parent reply	other threads:[~2024-05-13 23:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-13  8:42 syntax? in scheme/Guile Damien Mattei
2024-05-13 21:02 ` Damien Mattei
2024-05-13 23:42 ` Thompson, David [this message]
2024-05-14  7:39   ` Damien Mattei

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