GNU bug report logs - #57003
28.1.90; Can local variables be loaded before loading major mode?

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Message #19 received at 57003 <at> debbugs.gnu.org (full text, mbox):

From: Phil Sainty <psainty <at> orcon.net.nz>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 57003 <at> debbugs.gnu.org,
 Ihor Radchenko <yantar92 <at> gmail.com>
Subject: Re: bug#57003: 28.1.90; Can local variables be loaded before
 loading major mode?
Date: Sun, 07 Aug 2022 02:34:01 +1200

On 2022-08-07 02:00, Visuwesh wrote:
> Correct me if I'm wrong, this is about the major-mode definition
> clearing the buffer's local variables before turning on the major-mode,
> right?

To elaborate, every major mode calls `kill-all-local-variables',
and this is pretty much the first thing that happens (although
`change-major-mode-hook' runs before the local variables are
actually clobbered).

https://stackoverflow.com/a/19295380/324105 (specifically the
"Derived modes, and mode hooks" section) might be a useful write-up
if you want to get your head around the sequence of events.

Note that variables which are marked as permanent-local will
retain their values.  Refer to:

M-x elisp-index-search RET kill-all-local-variables


-Phil

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