commit https://github.com/vim/vim/commit/3ea0f1ae318db6cd9413914bb2ff824d71cefc6e Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 23 22:07:32 2016 +0100 patch 7.4.1408 Problem: MS-Windows doesn't have isnan() and isinf(). Solution: Use _isnan() and _isinf().

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