commit https://github.com/vim/vim/commit/b2658a1ab02cd0ba848164f70c7c464fdc398162 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Apr 26 17:16:24 2016 +0200 patch 7.4.1787 Problem: When a job ends the close callback is invoked before other callbacks. On Windows the close callback is not called. Solution: First invoke out/err callbacks before the close callback. Make the close callback work on Windows.

" 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