commit https://github.com/vim/vim/commit/bfd096d02087a10e8e2f4bdfb74e0435506fa8bb Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 17 22:29:09 2016 +0200 patch 7.4.2225 Problem: Crash when placing a sign in a deleted buffer. Solution: Check for missing buffer name. (Dominique Pelle). Add a test.

" 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