From: ludo@gnu.org (Ludovic Courtès)
To: bug-guile@gnu.org
Subject: Re: Errors using `reload' command
Date: Wed, 09 Feb 2011 10:51:04 +0100 [thread overview]
Message-ID: <877hd9zgc7.fsf@gnu.org> (raw)
In-Reply-To: m3y65pei0o.fsf@unquote.localdomain
Hi!
Andy Wingo <wingo@pobox.com> writes:
> On Tue 08 Feb 2011 23:58, Andy Wingo <wingo@pobox.com> writes:
>
>> On Thu 03 Feb 2011 20:18, Mark Harig <idirectscm@aim.com> writes:
>>
>>> scheme@(guile-user)> ,re (ice-9 readline)
>>
>> Actually now this causes an infinite loop. Doh. We need defvar,
>> somehow...
>
> What do people think about this:
>
> (define-syntax define-once
> (syntax-rules ()
> ((_ sym val)
> (define sym (if (defined? 'sym) sym val)))))
Looks cool!
How about this variant?
(define-syntax define-once
(syntax-rules ()
((_ sym val)
(define sym (if (defined? 'sym) sym val)))
((_ sym val docstring)
(begin
(define-once sym val)
(set-doc-property! (module-variable (current-module) 'sym)
docstring)))))
Ludo’.
next prev parent reply other threads:[~2011-02-09 9:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 19:18 Errors using `reload' command Mark Harig
2011-02-08 22:48 ` Andy Wingo
2011-02-08 22:58 ` Andy Wingo
2011-02-09 8:20 ` Andy Wingo
2011-02-09 9:51 ` Ludovic Courtès [this message]
2011-02-09 19:59 ` Andy Wingo
2011-02-09 20:49 ` Ludovic Courtès
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