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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: The netsec thread
Date: Mon, 23 Jul 2018 05:32:21 +0300
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> From: Jimmy Yuen Ho Wong <wyuenho@gmail.com>
> Date: Mon, 23 Jul 2018 02:52:23 +0100
> Cc: Eli Zaretskii <eliz@gnu.org>, Emacs-Devel devel <emacs-devel@gnu.org>
> 
> That sound great, but what is this select-safe-coding-system and how
> do I look at its UI?

lisp/international/mule-cmds.el, look at
select-safe-coding-system-interactively, a subroutine of
select-safe-coding-system.  In a nutshell, it prepares and pops up a
buffer with special content, then prompts the user to select one of
several alternatives.