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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Installing cond* in core
Date: Tue, 30 Jan 2024 15:04:42 +0200
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> From: Richard Stallman <rms@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Mon, 29 Jan 2024 22:58:34 -0500
> 
> There should be no need to preload cond* because it defines no
> run-time support.  All its work is done at macroexpand time.

Which is why we should try to make sure all preloaded files require
cond* only with eval-when-compile.

> Perhaps there will be an issue about using it in *non-compiled* files
> that are loaded early.  Is any such file complex enough to want to use
> constructs such as cond* or pcase?

I don't think we have such files, at least not now.