patch 8.2.3336: behavior of negative index in list change changed Commit: https://github.com/vim/vim/commit/92f05f21afdb8a43581554a252cb2fc050f9e03b Author: Bram Moolenaar <Bram@vim.org> Date: Thu Aug 12 21:12:56 2021 +0200 patch 8.2.3336: behavior of negative index in list change changed Problem: Behavior of negative index in list change changed. (Naruhiko Nishino) Solution: Only change it for Vim9 script. (closes #8749)

" Vim Compiler File
" Compiler:	xmlwf
" Maintainer:	Robert Rowsome <rowsome@wam.umd.edu>
" Last Change:	2019 Jul 23

if exists("current_compiler")
  finish
endif
let current_compiler = "xmlwf"

let s:cpo_save = &cpo
set cpo&vim

if exists(":CompilerSet") != 2		" older Vim always used :setlocal
  command -nargs=* CompilerSet setlocal <args>
endif

CompilerSet makeprg=xmlwf\ %:S

CompilerSet errorformat=%f:%l%c:%m

let &cpo = s:cpo_save
unlet s:cpo_save