commit https://github.com/vim/vim/commit/d3c907b5d2b352482b580a0cf687cbbea4c19ea1 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 17 21:32:09 2016 +0200 patch 7.4.2223 Problem: Buffer overflow when using latin1 character with feedkeys(). Solution: Check for an illegal character. Add a test.

Test for search('multi-byte char', 'bce')

STARTTEST
:source small.vim
:source mbyte.vim
:set encoding=utf-8
:/^Test bce:/+1
:$put =search('Ａ', 'bce', line('.'))
:1;/^Results:/,$wq! test.out
ENDTEST

Results:

Test bce:
Ａ