> From: Ship Mints <shipmints@gmail.com>
> Date: Fri, 13 Sep 2024 15:38:28 -0400
> Cc: Stefan Kangas <stefankangas@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
>       Michael Heerdegen <michael_heerdegen@web.de>, 73098@debbugs.gnu.org
>
> The warning messages can be misleading. e.g., when trying to set tab-bar-format-tabs-groups to include a
> simple lambda, it complains about the wrong thing. It does match the hook type, but does not match the
> hard-coded list of options.
>
>    (setopt tab-bar-format
>            `(
>              tab-bar-format-tabs-groups
>              (lambda () " ") ; tab-bar-separator
>     ))
>
>  ■  Warning (emacs): Value '(nil tab-bar-format-tabs-groups (lambda nil " "))' does not match type hook

I don't get a warning when I evaluate the above.  Is this in "emacs -Q"?