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From: Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
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Subject: Re: Emacs 30.0 warning from `cl-pushnew' and `memql'
Date: Thu, 29 Dec 2022 17:31:06 -0500
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> (let ((lst '()))
>   (cl-pushnew "a" lst)
>   (cl-pushnew "a" lst)
>   lst) ; ("a" "a")

It may sometimes return ("a" "a") but it may also return ("a").
Case in point, I think it will do the first when interpreted and the
second when compiled.


        Stefan