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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Adding streams for standard out and standard err
Date: Thu, 21 Jul 2016 22:11:31 +0300
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> From: phillip.lord@russet.org.uk (Phillip Lord)
> Cc: emacs-devel@gnu.org
> Date: Thu, 21 Jul 2016 19:52:58 +0100
> 
> (append-to-file (print buffer-undo-list) nil "/dev/stderr")
> 
> seems clunky compared to:
> 
> (print buffer-undo-list 'stdout)

Nothing a simple function won't heal, right?

Maybe that's all we need: a small wrapper around append-to-file.