GNU bug report logs - #8712
24.0.50; getting the "Forgot to expand macro XXXX" error - problem? solution?

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Package: emacs;

Reported by: "Drew Adams" <drew.adams <at> oracle.com>

Date: Sat, 21 May 2011 21:02:02 UTC

Severity: normal

Found in version 24.0.50

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

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Message #17 received at 8712 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: "Drew Adams" <drew.adams <at> oracle.com>
Cc: 8712 <at> debbugs.gnu.org
Subject: Re: bug#8712: 24.0.50;
	getting the "Forgot to expand macro XXXX" error - problem? solution?
Date: Sun, 22 May 2011 22:36:34 -0300

> I do have a question about the follownig warning, however (which I have not
> seen/noticed before):

>  (lambda (opt) ...) quoted with ' rather than with #'

> That presumably comes from a defmacro that has, in effect, this:

>  ` ... (let* (... (something (lambda (opt)...))))

This is because you pass (lambda (opt) ...) as `function' argument
to a macro that then splices it with

  `(.... ',function ....)

so the expanded code contains '(lambda (opt) ...).
Splice it with #', instead.

> That is, an unquoted lambda inside a backquote.  The backquote expands
> to (quote (lambda...)) no doubt.

No, backquote does not know you're building code, so it can't freely
decide to add `quote' symbols as it sees fit.


        Stefan
This bug report was last modified 13 years and 315 days ago.

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