patch 8.2.1621: crash when using submatch(0, 1) in substitute() Commit: https://github.com/vim/vim/commit/8a0dcf43305586853f452a77fa295b0c8d54b463 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Sep 6 15:14:45 2020 +0200 patch 8.2.1621: crash when using submatch(0, 1) in substitute() Problem: Crash when using submatch(0, 1) in substitute(). Solution: Increment reference count. (closes https://github.com/vim/vim/issues/6887)