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From: Alex Schroeder <alex@gnu.org>
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Subject: Re: Dealing with Unicode
Date: Fri, 11 Oct 2013 12:09:42 +0200
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Alex Schroeder <alex@gnu.org> writes:

>  name: SMILING FACE WITH HEART-SHAPED EYES
>
> After a few seconds, I get shown the buffer ` *Format Temp 0*' 
> and a
> warning:
>
> ----------------------------------------------------------------------
> These default coding systems were tried to encode text
> in the buffer ` *Format Temp 0*':
>  (emacs-mule (164 . 128525))
>
> How can I prevent this error message? Why is Gnus (or Emacs?) 
> using
> emacs-mule to save this buffer?

Perhaps the culprit is an entry in auto-coding-alist:

 ("/#[^/]+#\\'" . emacs-mule)

I'll try using utf-8 and we'll see how it goes.