commit https://github.com/vim/vim/commit/a63cdb5ed685181c377ee89f1d1de6a97dfeb151 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 20 18:24:45 2016 +0100 patch 7.4.1621 Problem: Channel test doesn't work with Python 2.6. Solution: Add number in formatting placeholder. (Wiredool)

" 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