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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: emacs-27 60c84ad: ; * etc/TODO: Fix last change.
Date: Mon, 02 Mar 2020 16:36:11 +0200
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> Date: Mon, 02 Mar 2020 16:24:30 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> You could run regexp-opt in a separate emacs invocation, then write
> the results to a file, and load that, I guess.

On second thought: why do you need regexp-opt in this case?  None of
the other composition rules we have (search lisp/language/*.el for
composition-function-table) use that, so why is Emoji different?