patch 9.0.1531: crash when register contents ends up being invalid Commit: https://github.com/vim/vim/commit/d1ae8366aff286d41e7f5bc513cc0a1af5130aad Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 9 17:09:30 2023 +0100 patch 9.0.1531: crash when register contents ends up being invalid Problem: Crash when register contents ends up being invalid. Solution: Check "y_array" is not NULL.

" Vim filetype plugin file
" Language:	hg (Mercurial) commit file
" Maintainer:	Ken Takata <kentkt at csc dot jp>
" Last Change:	2016 Jan 6
" Filenames:	hg-editor-*.txt
" License:	VIM License
" URL:		https://github.com/k-takata/hg-vim

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

setlocal nomodeline

let b:undo_ftplugin = 'setl modeline<'