GNU bug report logs - #78125
29.3; Obsolete text-mode-variant used in elisp manual

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From: Ross Boylan <rossboylan <at> stanfordalumni.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 78125-done <at> debbugs.gnu.org
Subject: bug#78125: 29.3; Obsolete text-mode-variant used in elisp manual
Date: Tue, 29 Apr 2025 10:21:12 -0700

Thanks, Eli!
Ross

On Tue, Apr 29, 2025 at 12:13 AM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: rossboylan <at> stanfordalumni.org
> > Date: Mon, 28 Apr 2025 18:15:31 -0700
> >
> >
> > >From emacs 29.3, open the Elisp info documentation.  That
> > documentation says it is for emacs 29.2.  The `Example Major Modes`
> > includes the code `(setq-local text-mode-variant t)`.
> >
> > I tried using some old code that included that command.  The result was
> >
> > .emacs:39:15: Warning: ‘text-mode-variant’ is an obsolete variable (as of
> >     27.1); use ‘derived-mode-p’ instead.
> >
> > So I think the example needs to be updated.
>
> Thanks.
>
> I updated the example on the emacs-30 branch, but note that the actual
> definition of text-mode still sets that variable, since we haven't
> removed it yet.
>
> > A secondary matter: naively following the error message would result in
> > this code: (setq-local derived-mode-p t), which I assume is a bad idea
> > and probably an error.
>
> Yes, you are supposed to look up the documentation of the replacement
> to figure out how to use it.  I made the text of the obsolescence
> message more clear in that regard.
>
> And with that, I'm closing this bug.

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