From: Maxime Devos <maximedevos@telenet.be>
To: yarl baudig <yarl-baudig@mailoo.org>,
jean@abou-samra.fr, guile-devel@gnu.org
Subject: Re: define-module, #:export and export
Date: Fri, 6 Jan 2023 14:55:11 +0100 [thread overview]
Message-ID: <f9c593e3-a5f1-8345-3120-25d32b2ddc27@telenet.be> (raw)
In-Reply-To: <ea-mime-63b822bf-593a-70287a42@www.mailo.com>
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On 06-01-2023 14:31, yarl baudig wrote:
>>
>> That is also my understanding, confirmed by
>>
>> $ cat lib.scm
>> (define-module (lib)
>> #:export (test))
>>
>> (define-syntax test
>> (lambda (sintax)
>> (syntax-case sintax ()
>> ((test id)
>> (datum->syntax sintax (free-identifier=? #'id #'thing))))))
>> [...]
>>
>
> Thank you both. I am trying to process this. I (re-)read 6.8 Macros and read tspl4. I don't understand why you use "datum->syntax" > I heard your suggestion. I am only trying to grasp things for now. I
realize I don't know enough (on guile and on guix) to go on a concrete
goal yet.
> I need to work more on this in order to understand but I wanted to thank you for answering that quickly!
free-identifier=? returns a boolean. However, the return value of the
clauses of the syntax-case must be a syntax object. Hence Jean
converted the boolean into a syntax form with datum->syntax (IIUC).
Guile's implementation of macros is a little lax with typing,
in the sense that objects like #false and #true (but not symbols,
because hygiene) can be returned too, but IIUC this is undocumented and
not standard Scheme (*).
(*): unverified
Greetings,
Maxime.
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next prev parent reply other threads:[~2023-01-06 13:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-04 15:11 define-module, #:export and export yarl baudig
2023-01-04 17:28 ` Maxime Devos
2023-01-05 2:07 ` Jean Abou Samra
2023-01-06 13:31 ` yarl baudig
2023-01-06 13:55 ` Maxime Devos [this message]
2023-01-07 16:24 ` Jean Abou Samra
2023-01-08 9:46 ` yarl baudig
2023-01-08 13:19 ` Jean Abou Samra
2023-01-08 15:18 ` yarl baudig
2023-01-08 15:23 ` Jean Abou Samra
2023-01-13 7:58 ` yarl baudig
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