patch 8.2.1373: Vim9: no error for assigning to non-existing script var Commit: https://github.com/vim/vim/commit/f9b2b49663226235f94f08230fe9023caf80a6e9 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 5 14:34:14 2020 +0200 patch 8.2.1373: Vim9: no error for assigning to non-existing script var Problem: Vim9: no error for assigning to non-existing script var. Solution: Check that in Vim9 script the variable was defined. (closes https://github.com/vim/vim/issues/6630)

" 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