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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Unused/obsolete `last-code-conversion-error'?
Date: Wed, 27 Aug 2014 19:54:17 +0300
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To: Dmitry Antipov <dmantipov@yandex.ru>
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> Date: Wed, 27 Aug 2014 20:21:51 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> CC: emacs-devel@gnu.org
> 
> On 08/27/2014 06:53 PM, Eli Zaretskii wrote:
> 
> > It is assigned values in coding.c, so "untouched" is inaccurate.
> 
> I mean "last change around it is dated back to 2009".
> 
> > Why is this an improvement?
> 
> Because it is just another set-but-never-used variable.

But your change still assigns values to variables, so I see no real
difference.