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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: master 506270f: Don't compare arguments that can be nil
Date: Sat, 16 Dec 2017 16:08:29 -0500
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Cc: Oscar Fuentes <ofv@wanadoo.es>
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Oscar Fuentes wrote:

> branch: master
> commit 506270f9c80bf9bd7dad35a2f0aa6f477da6490b
[...]
>     * lisp/ses.el (ses--advice-copy-region-as-kill): avoid comparison
>       unless `beg' and `end' are non-nil.

This is https://debbugs.gnu.org/28039, which seems like something to
fix in the emacs-26 branch.