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From: Tomas Hlavaty <tom@logand.com>
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Subject: Re: Closures in Emacs and their usage scenarios.
Date: Wed, 29 Sep 2021 08:10:36 +0200
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On Wed 29 Sep 2021 at 00:04, Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
> And captured variables that are mutated are also quite rare

I don't think so.  The best thing about closures is that they allow
wrapping state mutations under simple interface of funcall.