GNU bug report logs - #52290
28.0.90; Undocumented generalized variables

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Package: emacs;

Reported by: Phil Sainty <psainty <at> orcon.net.nz>

Date: Sun, 5 Dec 2021 01:27:01 UTC

Severity: normal

Tags: moreinfo

Found in version 28.0.90

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #26 received at 52290 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: Phil Sainty <psainty <at> orcon.net.nz>, 52290 <at> debbugs.gnu.org,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#52290: 28.0.90; Undocumented generalized variables
Date: Sun, 05 Dec 2021 03:52:43 +0100

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> I only wanted to note that some generalized vars might be more useful
> with `cl-letf' than with plain setf, you get some extra kinds of
> excursions gratis (sometimes doesn't work as expected though).  Example:
>
> #+begin_src emacs-lisp
> (cl-letf (((cons (point-min) (point-max))
>            (cons (line-beginning-position) (line-end-position))))
>         (recursive-edit))
> #+end_src

That's...  quote obscure.  😀

Being able to say `(decf (point))' seems kinda nice, but I think even
that is a bit on the obscure side.  I.e., all the generalised variables
that are used for side effect (as opposed to mutating an explicit
object) are liable to cause confusion.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
This bug report was last modified 2 years and 289 days ago.

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