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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Instead of pcase
Date: Mon, 04 Dec 2023 15:20:22 +0200
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To: Lynn Winebarger <owinebar@gmail.com>
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 (message from Lynn Winebarger on Mon, 4 Dec 2023 07:35:48 -0500)
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> From: Lynn Winebarger <owinebar@gmail.com>
> Date: Mon, 4 Dec 2023 07:35:48 -0500
> Cc: Richard Stallman <rms@gnu.org>, schwab@linux-m68k.org,
>  emacs-devel <emacs-devel@gnu.org>
> 
> Elisp will happily evaluate the expression 
> (if . ( t . (nil . (t . nil))))
> 
> Would you, or anyone, say that reflects some flaw in the design of the "if" form?

No, but if someone writes such 'if' forms, I will ask them to rewrite
them.

IOW, the fact that the Lisp reader will happily read something does
not mean it is easily understandable by humans, or should freely be
used in Emacs.