GNU bug report logs - #27016
possible bug in `defsetf'

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Package: emacs;

Reported by: Rafael D Sorkin <rsorkin <at> perimeterinstitute.ca>

Date: Mon, 22 May 2017 06:40:01 UTC

Severity: minor

Tags: fixed, patch

Found in versions 24.4, 25.2

Fixed in version 26.1

Done: npostavs <at> users.sourceforge.net

Bug is archived. No further changes may be made.

Full log

Message #71 received at 27016 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 27016 <at> debbugs.gnu.org, Rafael D Sorkin <rsorkin <at> perimeterinstitute.ca>
Subject: Re: bug#27016: possible bug in `defsetf'
Date: Thu, 25 May 2017 16:42:50 -0400

On Thu, May 25, 2017 at 4:26 PM, Michael Heerdegen
<michael_heerdegen <at> web.de> wrote:
> npostavs <at> users.sourceforge.net writes:
>
>> Oh, I think `eval-when' should be equivalent:
>>
>>     (eval-when (compile load eval)
>>       (unless t
>>         (defsetf foobar setcar)))
>
> FWIW, I don't understand.  Doesn't that just expand to the same code as
> before when evaluated?  That code is just evaluated under even more
> circumstances.

Hmm, I thought it would cause the 'unless t' to happen in the
macroexpansion phase as well, but I was wrong. Apparently 'eval-when'
doesn't have this effect, only eval-when-compile or eval-and-compile
will do the trick.
This bug report was last modified 7 years and 290 days ago.

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