patch 8.2.4312: no error for using :vim9script in a :def function Commit: https://github.com/vim/vim/commit/107f7325f615a1ffa5b49521e316b44e117b0a04 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 6 17:30:41 2022 +0000 patch 8.2.4312: no error for using :vim9script in a :def function Problem: No error for using :vim9script in a :def function. Solution: Give an error when compiling.

" 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