patch 8.2.3651: Vim9: no error for :lock or :unlock with unknown variable Commit: https://github.com/vim/vim/commit/04b568b38f848293e1ae0e680685280151acb386 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Nov 22 21:58:41 2021 +0000 patch 8.2.3651: Vim9: no error for :lock or :unlock with unknown variable Problem: Vim9: no error for :lock or :unlock with unknown variable. Solution: Give an error. (closes https://github.com/vim/vim/issues/9188)

#!/bin/bash
set -e

apt-get install -y xvfb

cat <<EOT >/etc/systemd/system/xvfb.service
[Unit]
Description=X Virtual Frame Buffer Service
After=network.target
[Service]
ExecStart=/usr/bin/Xvfb :99 -screen 0 1024x768x24
[Install]
WantedBy=multi-user.target
EOT

systemctl enable xvfb.service
systemctl start xvfb.service