patch 8.2.2693: Vim9: locked script variable can be changed Commit: https://github.com/vim/vim/commit/dcf29ac87f4d7a62c503ba6de0d92c7779446bf2 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Apr 2 14:44:02 2021 +0200 patch 8.2.2693: Vim9: locked script variable can be changed Problem: Vim9: locked script variable can be changed. Solution: Check legacy script variable for being locked. (issue https://github.com/vim/vim/issues/8031)

" Vim filetype plugin
" Language:	roff(7)
" Maintainer:	Aman Verma
" Homepage:	https://github.com/a-vrma/vim-nroff-ftplugin
" Previous Maintainer:	Chris Spiegel <cspiegel@gmail.com>
" Last Change:	2020 Nov 21

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

setlocal commentstring=.\\\"%s
setlocal comments=:.\\\"
setlocal sections+=Sh

let b:undo_ftplugin = 'setlocal commentstring< comments< sections<'