patch 8.2.3422: Vim9: no failure if return type differs from returned var Commit: https://github.com/vim/vim/commit/efc084e3353d6854b6dac8b240f70cb0abb838ad Author: Bram Moolenaar <Bram@vim.org> Date: Thu Sep 9 22:30:52 2021 +0200 patch 8.2.3422: Vim9: no failure if return type differs from returned var Problem: Vim9: no failure if return type differs from returned variable. Solution: Copy type when copying a list. (closes https://github.com/vim/vim/issues/8847)

" 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