commit https://github.com/vim/vim/commit/a641e1d4da3f9152c489318c06a93fcd1c746637 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 13 21:16:03 2016 +0200 patch 7.4.1931 Problem: Using both old and new style file mark lines from viminfo. Solution: Skip the old style lines if the viminfo file was written with a Vim version that supports the new style.

" VIM syntax file
" Language:	groff
" Maintainer:	Alejandro López-Valencia <dradul@yahoo.com>
" URL:		http://dradul.tripod.com/vim
" Last Change:	2003-05-08-12:41:13 GMT-5.

" This uses the nroff.vim syntax file.
let b:main_syntax = "nroff"
let b:nroff_is_groff = 1
runtime! syntax/nroff.vim