GNU bug report logs - #74040
`require-with-check` signals error for `project`

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#74040: closed (`require-with-check` signals error for `project`)
Date: Tue, 29 Oct 2024 02:43:01 +0000

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Your message dated Mon, 28 Oct 2024 22:42:16 -0400
with message-id <jwvh68vk4x0.fsf-monnier+emacs <at> gnu.org>
and subject line Re: bug#74040: `require-with-check` signals error for `project`
has caused the debbugs.gnu.org bug report #74040,
regarding `require-with-check` signals error for `project`
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: `require-with-check` signals error for `project`
Date: Sat, 26 Oct 2024 23:15:01 -0400

Package: Emacs
Version: 30.0.50

1. Customize `load-prefer-newer` to t.
2. Edit project.el in-tree, save it, don't recompile Emacs.
3. Restart Emacs.
4. Visit some code file and try to launch `M-x eglot` there.

You should get an error along the lines of:

    require-with-check: Feature ‘project’ loaded from
    ".../lisp/progmodes/project.el" is now provided by
    ".../lisp/progmodes/project.elc"

This error is spurious.  AFAICT, it is due to the fact that
`require-with-check` uses `locate-file` to "guess" which file `load`
would use, but `locate-file` doesn't obey `load-prefer-newer`, so it
guesses wrong.


        Stefan

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 74040-done <at> debbugs.gnu.org
Subject: Re: bug#74040: `require-with-check` signals error for `project`
Date: Mon, 28 Oct 2024 22:42:16 -0400

> Either patch is fine by me, but having the change more localized is
> certainly nice.

Agreed.

> Do you have any other use case in mind for the new PREFER-NEWER argument
> of `locate-file` than `require-with-check`?  If not, perhaps we should
> avoid making it more complex?

In principle, it's nice to be able to reproduce *exactly* the search
performed by `load` and `require`, but in practice, I don't have any
real use case, no.

I pushed the more localized patch (after fixing it so it actually
works).


        Stefan

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