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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Question Kill-ring modify last entry.
Date: Mon, 29 Jul 2019 17:18:12 +0300
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To: Ergus <spacibba@aol.com>
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> Date: Sun, 28 Jul 2019 23:45:15 +0200
> From: Ergus <spacibba@aol.com>
> 
> I have been reading the elisp documentation and it is unclear for me if
> there is a "canonical" (lets say formal/supported/provided/save)
> function to replace the last entry in the kill-ring with a new one (like
> the append option).

kill-new with its REPLACE argument non-nil, I think.  Is this what you
are looking for?