patch 8.2.2603: Vim9: no effect if user command is also a function Commit: https://github.com/vim/vim/commit/77b10ffad4ebad15022614be4db2745f6a90f405 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 14 13:21:35 2021 +0100 patch 8.2.2603: Vim9: no effect if user command is also a function Problem: Vim9: no effect if user command is also a function. Solution: Check for paren following. (closes https://github.com/vim/vim/issues/7960)

" 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