Re: Warn about comparing quoted lists (etc) using `eq`

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Wed, 14 Dec 2022 19:17:07 +0100
> 
> Given its usefulness and low risk (it does not actually change the behaviour 
> of anything) I suggest it be added to the emacs-29 branch.

No, please don't.  We have already too many last-minute new features
in Emacs 29.

> (Clearly we'd like to fix the mistakes found in emacs-29, and doing so is a 
> lot more convenient if the warning is actually there too.)

There's nothing to prevent us from running Emacs 30 on code from Emacs
29, is there?

So please install this on master.

Thanks.