From: Drew Adams <drew.adams@oracle.com>
To: Daniel Mendler <mail@daniel-mendler.de>,
"47992@debbugs.gnu.org" <47992@debbugs.gnu.org>
Cc: "monnier@iro.umontreal.ca" <monnier@iro.umontreal.ca>,
"jakanakaevangeli@chiru.no" <jakanakaevangeli@chiru.no>
Subject: bug#47992: [External] : bug#47992: 27; 28; Phase out use of `equal` in `add-hook`, `remove-hook`
Date: Sat, 24 Apr 2021 21:20:08 +0000 [thread overview]
Message-ID: <SA2PR10MB4474F1067410B93086415447F3449@SA2PR10MB4474.namprd10.prod.outlook.com> (raw)
In-Reply-To: <95dee1b3-10c4-24fb-e483-ec3f36bdf5f0@daniel-mendler.de>
> In order to improve the support for closures as hooks,
> this change is necessary.
Necessary? Why? There's no other way to do that?
> It is not reasonable to require every `add-hook` user,
> who wants to add a closure, to introduce a symbol
> indirection.
Why not? "Symbol indirection" just means setting a
symbol's `symbol-function' to the closure, then using
the symbol. Why is doing that a big deal?
It's what anyone should do when using `add|remove-hook',
at least interpreted, and interactively.
I ask again: If closure equality is inherently a
problem, why limit the "solution" to `add|remove-hook'?
Shouldn't your argument be that closure equality should
_always_ be tested (testable) using just `eq'? Is this
really about `add|remove-hook'? Why would they be
special in this regard?
> Furthermore I would argue there are no plausible scenarios where you
> want to add a closure or lambda as hook and then remove or add it again
> afterwards, but not using the identical object, but only an object
> which is `equal`.
M-: (add-hook 'foo-hook (lambda () (whatever)))
Of course that's generally not advisable, because if
you then want to remove it interactively you'll have
to provide a lambda that's `equal' (with `M-: M-p',
for example). But it's common enough, I think.
It's better, e.g., to defun or fset the lambda form,
and then use the symbol. But I'm guessing that many
users don't always bother, and they're just careful
to respect `equal' (or they soon learn to be).
Emacs's use of Lisp is also interactive, and often ad
hoc. If we lose sight of that we lose sight of Emacs.
> This is more than enough motivation for a change to `eq`.
It's your motivation; understood. Thx.
next prev parent reply other threads:[~2021-04-24 21:20 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-24 12:11 bug#47992: 27; 28; Phase out use of `equal` in `add-hook`, `remove-hook` Daniel Mendler
2021-04-24 20:12 ` bug#47992: [External] : " Drew Adams
2021-04-24 20:23 ` Daniel Mendler
2021-04-24 21:20 ` Drew Adams [this message]
2021-04-24 21:34 ` Daniel Mendler
2021-04-24 22:30 ` Stefan Monnier
2021-04-24 22:38 ` Daniel Mendler
2021-04-24 23:04 ` Stefan Monnier
2021-04-24 23:38 ` Daniel Mendler
2021-04-25 1:16 ` Drew Adams
2021-04-25 3:08 ` Stefan Monnier
2021-04-25 4:57 ` Drew Adams
2021-04-25 13:52 ` Stefan Monnier
2021-04-25 1:16 ` Drew Adams
2021-04-25 1:23 ` Drew Adams
2021-04-25 3:10 ` Stefan Monnier
2021-04-25 4:57 ` Drew Adams
2021-04-25 10:33 ` Daniel Mendler
2021-04-25 13:56 ` Stefan Monnier
2021-05-02 9:09 ` Lars Ingebrigtsen
2021-05-02 10:37 ` Daniel Mendler
2021-05-03 8:50 ` Lars Ingebrigtsen
2021-07-06 14:44 ` Olivier Certner
[not found] ` <877di6udfy.fsf@web.de>
2021-07-04 1:09 ` Lars Ingebrigtsen
2021-07-04 2:35 ` Michael Heerdegen
2021-07-04 2:56 ` Lars Ingebrigtsen
2021-07-04 4:28 ` Michael Heerdegen
2021-07-04 13:36 ` Lars Ingebrigtsen
2021-07-04 17:08 ` bug#47992: [External] : " Drew Adams
2021-07-04 22:45 ` Michael Heerdegen
2021-07-05 12:39 ` Lars Ingebrigtsen
2021-07-06 1:48 ` Richard Stallman
2021-07-06 2:37 ` bug#47992: [External] : " Drew Adams
2021-07-06 3:21 ` Michael Heerdegen
2021-07-07 23:57 ` Richard Stallman
2021-07-06 9:46 ` Arthur Miller
2021-07-07 23:57 ` Richard Stallman
2021-07-08 2:11 ` Arthur Miller
2021-07-04 23:15 ` Michael Heerdegen
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