patch 8.0.1803: warning for uninitialized variable commit https://github.com/vim/vim/commit/9b50f36e405309be97e28b5e19d81ff0902c5224 Author: Bram Moolenaar <Bram@vim.org> Date: Mon May 7 20:10:17 2018 +0200 patch 8.0.1803: warning for uninitialized variable Problem: Warning for uninitialized variable. (Tony Mechelynck) Solution: Initialize it.

" 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