GNU bug report logs - #31062
26.0.91; warning on UTF-8 encoding of unibyte text

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: charles <at> aurox.ch (Charles A. Roelli)
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.91; warning on UTF-8 encoding of unibyte text
Date: Wed, 04 Apr 2018 20:26:52 +0200

(This test case assumes a locale-coding-system of utf-8-unix, and
LANG: en_GB.UTF-8 or anything similar.)

emacs -q
C-x b test RET
M-: (insert-byte 195 1) RET
M-: (insert-byte 188 1) RET	> buffer text should look like \303\274
C-x C-s /tmp/foo RET		> the path is irrelevant

There's this warning:

These default coding systems were tried to encode text
in the buffer ‘test’:
  (utf-8-unix (1 . 4194243) (2 . 4194236))
However, each of them encountered characters it couldn’t encode:
  utf-8-unix cannot encode these: \303 \274

Is the text "(1 . 4194243) (2 . 4194236)" useful here?  It looks like
it's there by accident.  If it is helpful, could someone please
explain what it means?

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