patch 8.2.1373: Vim9: no error for assigning to non-existing script var Commit: https://github.com/vim/vim/commit/f9b2b49663226235f94f08230fe9023caf80a6e9 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 5 14:34:14 2020 +0200 patch 8.2.1373: Vim9: no error for assigning to non-existing script var Problem: Vim9: no error for assigning to non-existing script var. Solution: Check that in Vim9 script the variable was defined. (closes https://github.com/vim/vim/issues/6630)

" Vim filetype plugin file
" Language:             mutt RC File
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2006-04-19

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

let s:cpo_save = &cpo
set cpo&vim

let b:undo_ftplugin = "setl com< cms< inc< fo<"

setlocal comments=:# commentstring=#\ %s
setlocal formatoptions-=t formatoptions+=croql

let &l:include = '^\s*source\>'

let &cpo = s:cpo_save
unlet s:cpo_save