From: "Linus Björnstam" <linus.internet@fastmail.se>
To: "Mortimer Cladwell" <mbcladwell@gmail.com>, guile-user@gnu.org
Subject: Re: Meaning of <=> in the context of procedures
Date: Wed, 02 Jun 2021 18:21:39 +0200 [thread overview]
Message-ID: <5cee767e-f4a2-4dd9-ad96-203d9feba55b@www.fastmail.com> (raw)
In-Reply-To: <94db6b16-39d5-49ea-bc0a-f88f285fb4d9@www.fastmail.com>
To reply to myself: it is an exported identifier that is used in a define-json-mapping. It is good form for macros to export all its auxiliary syntax.
--
Linus Björnstam
On Wed, 2 Jun 2021, at 18:12, Linus Björnstam wrote:
> It is a trick to allow using the symbol '<=> as an identifier instead
> of quoting it. Nothing special. Guile-json probably uses it somehow.
>
> If it is used as auxiliary syntax in a macro, it is probably exported
> so guile can warn that it is being shadowed instead of (or rather: in
> addition to) producing bad error messages.
>
> --
> Linus Björnstam
>
> On Wed, 2 Jun 2021, at 16:06, Mortimer Cladwell wrote:
> > Hi,
> > What does <=> mean/do?
> > It can be found in guile-json in the (json record) module, line 33:
> >
> > 33 #:export (<=> define-json-mapping define-json-type))
> >
> > Not mentioned in the entire Guile manual. Happens to be defined on line 36
> > of the module:
> >
> > 36 (define <=> '<=>)
> >
> > I didn't find that very helpful :)
> > Thanks
> > Mortimer
> >
>
>
next prev parent reply other threads:[~2021-06-02 16:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 14:06 Meaning of <=> in the context of procedures Mortimer Cladwell
2021-06-02 16:12 ` Linus Björnstam
2021-06-02 16:21 ` Linus Björnstam [this message]
2021-08-04 11:55 ` Ludovic Courtès
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