bug#52290: 28.0.90; Undocumented generalized variables

[Lars Ingebrigtsen]

Michael Heerdegen <michael_heerdegen@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.

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