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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Thread return value
Date: Sun, 05 Nov 2023 11:48:54 +0200
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To: Manuel Giraud <manuel@ledu-giraud.fr>
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> Date: Sun, 05 Nov 2023 09:57:40 +0100
> From:  Manuel Giraud via "Emacs development discussions." <emacs-devel@gnu.org>
> 
> Is there a way to retrieve an Emacs thread's implicit return value?

Yes, by calling thread-join.