patch 8.2.1051: crash when changing a list while using reduce() on it Commit: https://github.com/vim/vim/commit/ca275a05d8b79f6a9101604fdede2373d0dea44e Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jun 24 22:07:46 2020 +0200 patch 8.2.1051: crash when changing a list while using reduce() on it Problem: Crash when changing a list while using reduce() on it. Solution: Lock the list. (closes https://github.com/vim/vim/issues/6330)