patch 8.2.0354: Python 3.9 does not define _Py_DEC_REFTOTAL Commit: https://github.com/vim/vim/commit/a65bb53514a1af1ec0dc5c4831dfaef69f139a48 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 4 22:06:07 2020 +0100 patch 8.2.0354: Python 3.9 does not define _Py_DEC_REFTOTAL Problem: Python 3.9 does not define _Py_DEC_REFTOTAL. (Zdenek Dohnal) Solution: Remove it, it was only for debugging.

" Vim filetype plugin file
" Language:	Diff
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2005 Jul 27

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl modeline<"

" Don't use modelines in a diff, they apply to the diffed file
setlocal nomodeline