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: Michael Heerdegen <michael_heerdegen <at> web.de>
To: npostavs <at> users.sourceforge.net
Cc: 27016 <at> debbugs.gnu.org, Rafael D Sorkin <rsorkin <at> perimeterinstitute.ca>
Subject: bug#27016: possible bug in `defsetf'
Date: Thu, 25 May 2017 22:26:40 +0200

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.

I would rather try something like

#+begin_src emacs-lisp
(unless t
  (eval '(progn (defalias 'foobar 'cons)
                (defsetf foobar setcar))))
#+end_src

to avoid the eager macro expansion unless the code is actually run.


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

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