patch 8.2.3021: spaces allowed between option name and "!", "?", etc. Commit: https://github.com/vim/vim/commit/208f0b48b2c616b29f377a1408290111ed2663f7 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 20 12:40:08 2021 +0200 patch 8.2.3021: spaces allowed between option name and "!", "?", etc. Problem: Spaces allowed between option name and "!", "?", etc. Solution: Disallow spaces in Vim9 script, it was not documented. (closes #8408)

" Settings for test script execution
" Always use "sh", don't use the value of "$SHELL".
set shell=sh

" Only when the +eval feature is present. 
if 1
  " While some tests overwrite $HOME to prevent them from polluting user files,
  " we need to remember the original value so that we can tell external systems
  " where to ask about their own user settings.
  let g:tester_HOME = $HOME
endif

source setup.vim