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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 18:09:57 +0200
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To: Evgeny Zajcev <lg.zevlg@gmail.com>
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	(message from Evgeny Zajcev on Wed, 27 Feb 2019 15:29:53 +0300)
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> From: Evgeny Zajcev <lg.zevlg@gmail.com>
> Date: Wed, 27 Feb 2019 15:29:53 +0300
> 
> It was quite surprising for me that
> 
>   (file-exists-p "")
>   ==> t

  http://lists.gnu.org/archive/html/emacs-devel/2009-04/msg00528.html

Nothing is new under the sun...