patch 8.1.0897: can modify a:000 when using a reference commit https://github.com/vim/vim/commit/05c00c038bc16e862e17f9e5c8d5a72af6cf7788 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Feb 11 22:00:11 2019 +0100 patch 8.1.0897: can modify a:000 when using a reference Problem: Can modify a:000 when using a reference. Solution: Make check for locked variable stricter. (Ozaki Kiichi, closes #3930)