patch 8.2.3336: behavior of negative index in list change changed Commit: https://github.com/vim/vim/commit/92f05f21afdb8a43581554a252cb2fc050f9e03b Author: Bram Moolenaar <Bram@vim.org> Date: Thu Aug 12 21:12:56 2021 +0200 patch 8.2.3336: behavior of negative index in list change changed Problem: Behavior of negative index in list change changed. (Naruhiko Nishino) Solution: Only change it for Vim9 script. (closes #8749)

" Vim syntax file
" Language:  systemd.unit(5)

if !exists('b:current_syntax')
  " Looks a lot like dosini files.
  runtime! syntax/dosini.vim
  let b:current_syntax = 'systemd'
endif