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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: file-exists-p on empty string
Date: Wed, 27 Feb 2019 20:46:23 +0200
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> From: lg.zevlg@gmail.com
> Date: Wed, 27 Feb 2019 21:42:46 +0300
> Cc: emacs-devel@gnu.org
> 
> I use `(and (not (string-empty-p fn)) (file-exists-p fn))` at the moment, but its kind of ugly

Why do you need to reject empty strings?