bug#31807: 27.0; `info-apropos' bad name or bad matching

[Drew Adams]

> Ouch!  Bitten by the crazy-quote monster.  Couldn't even save
> the file I wrote it in - asked me about possibly saving with
> Chinese this or that (in Emacs 27).

This is the scary text I saw, FWIW:

These default coding systems were tried to encode text
in the buffer 'aaaaa.txt':
  (undecided-unix (768 . 8216) (771 . 8217)) (iso-latin-1-unix (768
  . 8216) (771 . 8217))
However, each of them encountered characters it couldn't encode:
  undecided-unix cannot encode these: ' '
  iso-latin-1-unix cannot encode these: ' '

Click on a character (or switch to this window by 'C-x o'
and select the characters by RET) to jump to the place it appears,
where 'C-u C-x =' will give information about it.

Select one of the safe coding systems listed below,
or cancel the writing with C-g and edit the buffer
   to remove or modify the problematic characters,
or specify any other coding system (and risk losing
   the problematic characters).

  gb2312 shift_jis iso-2022-jp big5 utf-8 euc-kr euc-jis-2004 euc-jp
  euc-tw windows-1256 windows-1258 cp874 iso-2022-jp-2004 windows-1255
  cp869 windows-1253 iso-8859-7 adobe-standard-encoding macintosh
  windows-1257 windows-1254 windows-1252 windows-1250 windows-1251
  koi8-t gb18030 gbk big5-hkscs hz-gb-2312 utf-7 utf-16
  utf-16be-with-signature utf-16le-with-signature utf-16be utf-16le
  iso-2022-7bit utf-8-auto utf-8-with-signature eucjp-ms utf-8-hfs
  georgian-academy georgian-ps korean-cp949 japanese-shift-jis-2004
  japanese-iso-7bit-1978-irv japanese-cp932 pt154
  cyrillic-alternativnyj utf-7-imap utf-8-emacs prefer-utf-8