commit https://github.com/vim/vim/commit/95f096030ed1a8afea028f2ea295d6f6a70f466f Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 10 20:01:45 2016 +0100 patch 8.0.0074 Problem: Cannot make Vim fail on an internal error. Solution: Add IEMSG() and IEMSG2(). (Domenique Pelle) Avoid reporting an internal error without mentioning where.

" 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