commit https://github.com/vim/vim/commit/e7fedb6ebe72d9a475aa65109b77d5ed4667067a Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 31 19:07:19 2015 +0100 patch 7.4.1008 Problem: The OS/2 code pollutes the source while nobody uses it these days. Solution: Drop the support for OS/2.

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