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.

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Rafael D Sorkin <rsorkin <at> perimeterinstitute.ca>
Cc: 27016 <at> debbugs.gnu.org
Subject: bug#27016: possible bug in `defsetf'
Date: Thu, 25 May 2017 23:50:54 -0400

> (unless t
>   (defalias 'foobar 'cons)
>   (defsetf foobar setcar))		; nil 
> (foobar pair)				; same as above
> (setf (foobar pair) 0)			; 0       !

I can confirm that it's a bug.  It's perfectly correct for the defsetf
to be macroexpanded, but not to be evaluated.
Not sure how best to get that behavior.  The naive/straightforward way
might be to introduce some sort of eval-and-compile-when-at-toplevel,
but there's probably a better way.  The first thing to do is to look at
how it was done in Emacs-23.


        Stefan
This bug report was last modified 7 years and 290 days ago.

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