Re: search-forward-regexp has stopped working on multibyte

[Richard Stallman]

    Place a few multibyte characters in the buffer, say with
    C-u C-\ latin-1-prefix RET "a "o "s

    Copy them into the killring.  Type
      M-: (search-forward-regexp (regexp-quote "
    Press C-y and then
      ")) RET

    And nothing gets found.  Not good.

It doesn't fail for me.