patch 8.2.0576: some errors are not covered by tests Commit: https://github.com/vim/vim/commit/067297e16a516838dbc46aaa9d8b1a507afec28d Author: Bram Moolenaar <Bram@vim.org> Date: Mon Apr 13 19:55:50 2020 +0200 patch 8.2.0576: some errors are not covered by tests Problem: Some errors are not covered by tests. Solution: Add a few more tests. (Dominique Pelle, closes https://github.com/vim/vim/issues/5920)