From: adriano <randomlooser@riseup.net>
To: guile-user <guile-user@gnu.org>
Subject: Re: macro syntax-error works in prefix but not curly-infix
Date: Sun, 19 Sep 2021 08:23:45 +0200 [thread overview]
Message-ID: <9e413208bf72c04fa0d5ce3063a7d68285593173.camel@riseup.net> (raw)
In-Reply-To: <CADEOadd_1k-GH_ZfQ9bLsMot7x4jNEm6OCrRHq-QN7KHjjAN_A@mail.gmail.com>
Il giorno sab, 04/09/2021 alle 16.41 +0200, Damien Mattei ha scritto:
> hi,
>
> i have this macro:
>
> (define-syntax <+
> (syntax-rules ()
> ((_ var expr) (define var expr))
> ((_ err ...) (syntax-error "Bad <- form")) ;; does not work in
> infix !
> ))
>
> why my syntax-error pattern never reach in infix:
>
> scheme@(guile-user)> {x <+ 7 8}
> While compiling expression:
> Syntax error:
> unknown file:3:3: source expression failed to match any pattern in
> form <+
>
> but ok in prefix:
>
> scheme@(guile-user)> (<+ x 9 10)
> While compiling expression:
> Syntax error:
> unknown location: <+: Bad <- form in form (<+ x 9 10)
>
> why?
> Regards,
> Damien
As far as I understand, infix syntax can't be achieved through macros
You'd need a custom reader for that
I might be wrong, but at least I offered something
next prev parent reply other threads:[~2021-09-19 6:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-04 14:41 macro syntax-error works in prefix but not curly-infix Damien Mattei
2021-09-19 6:23 ` adriano [this message]
2021-09-19 7:48 ` Damien Mattei
2021-09-19 12:34 ` Zelphir Kaltstahl
2021-09-20 9:16 ` Damien Mattei
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