From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Thierry Volpiatto <thierry.volpiatto@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: defmacro* usage
Date: Wed, 02 Nov 2011 09:04:07 -0400 [thread overview]
Message-ID: <jwvd3dahe5u.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87ipn2rcer.fsf@gmail.com> (Thierry Volpiatto's message of "Wed, 02 Nov 2011 12:28:44 +0100")
> I have an error with following recipe:
> #+BEGIN_SRC lisp
> (defmacro* test1 (&key (lang 'french))
> `(case ,lang
> (french (message "Bonjour"))
> (english (message "Hello"))))
[...]
> As you can see, the quoted default argument 'french cause an error with
> the defmacro* and work fine with the defun*.
The error is not from defmacro* but from the code you generated using defmacro*.
> Is it a bug or i misunderstand something?
A misunderstanding. Think harder about what your macro does. E.g. try
(macroexpand '(test1 :lang 'toto)) and (macroexpand '(test1)).
During macroexpansion, your `lang' is not supposed to hold a "language
value" but "a Lisp expression that will evaluate to a language value".
Stefan
next prev parent reply other threads:[~2011-11-02 13:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-02 11:28 defmacro* usage Thierry Volpiatto
2011-11-02 13:02 ` Andreas Schwab
2011-11-02 13:04 ` Stefan Monnier [this message]
2011-11-02 13:15 ` Thierry Volpiatto
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