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.

" Settings for test script execution
" Always use "COMMAND.COM", don't use the value of "$SHELL".
set shell=c:\COMMAND.COM shellquote= shellxquote= shellcmdflag=/c shellredir=>
" This is used only when the +eval feature is available.
if executable("cmd.exe")
   set shell=cmd.exe
endif

source setup.vim