patch 9.0.1589: filetype test contains too many special characters Commit: https://github.com/vim/vim/commit/b140c114f641ac4cd4fb04e7bdec031295264a8d Author: Bram Moolenaar <Bram@vim.org> Date: Mon May 29 17:06:05 2023 +0100 patch 9.0.1589: filetype test contains too many special characters Problem: Filetype test contains too many special characters. Solution: Use Vim9 syntax for a few things.

" 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