patch 8.2.3091: Vim9: default argument expr. cannot use previous argument Commit: https://github.com/vim/vim/commit/e28d9b3bd4de2c7288add83ec35dc001ba280617 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jul 3 18:56:53 2021 +0200 patch 8.2.3091: Vim9: default argument expr. cannot use previous argument Problem: Vim9: default argument expression cannot use previous argument Solution: Correct argument index. (closes https://github.com/vim/vim/issues/8496)