patch 9.0.1524: passing -1 for bool is not always rejected Commit: https://github.com/vim/vim/commit/8cf51376b842e0060edf08bd2e5bd9933c552ecf Author: zeertzjq <zeertzjq@outlook.com> Date: Mon May 8 15:31:38 2023 +0100 patch 9.0.1524: passing -1 for bool is not always rejected Problem: Passing -1 for bool is not always rejected. Solution: Check for error in a better way. (closes https://github.com/vim/vim/issues/12358)

" 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