patch 8.2.1140: Vim9: return type of extend() is any Commit: https://github.com/vim/vim/commit/b3c019cbc32e2e9250ac668bf77d61ebd89c13f2 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 5 20:08:39 2020 +0200 patch 8.2.1140: Vim9: return type of extend() is any Problem: Vim9: return type of extend() is any. Solution: Use type of the argument.

" 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