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Date: Mon, 22 Apr 2019 09:33:26 +0300
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From: Eli Zaretskii <eliz@gnu.org>
To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
CC: npostavs@gmail.com, david@tethera.net, notmuch@notmuchmail.org,
 35370@debbugs.gnu.org
In-reply-to: <874l6qx0px.fsf@fifthhorseman.net> (message from Daniel Kahn
 Gillmor on Sun, 21 Apr 2019 21:55:38 -0400)
Subject: Re: bug#35370: notmuch-emacs: avoiding deprecated
 message-default-charset
References: <87tveswipo.fsf@fifthhorseman.net> <874l6re7zh.fsf@tethera.net>
 <87a7gjw479.fsf@fifthhorseman.net> <87sgubrp40.fsf@gmail.com>
 <874l6qx0px.fsf@fifthhorseman.net>
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> From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
> Date: Sun, 21 Apr 2019 21:55:38 -0400
> Cc: david@tethera.net, notmuch@notmuchmail.org, 35370@debbugs.gnu.org
> 
> Do you have any recommendation for how an external emacs module (which
> aims to work with at emacs 25 as well at least) should handle this?

Just remove any uses of it.  Why are you using it now?