patch 8.2.1037: Vim9: crash when using line continuation inside :def Commit: https://github.com/vim/vim/commit/acd4c5e914f8a06745624ba585f3d06d5faf4ddd Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 22 19:39:03 2020 +0200 patch 8.2.1037: Vim9: crash when using line continuation inside :def Problem: Vim9: crash when using line continuation inside :def. Solution: Check for no more lines available.

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s