patch 8.2.2138: Vim9: "exit_cb" causes Vim to exit Commit: https://github.com/vim/vim/commit/b5b9480ee936ef4cd0e350c468ef8c5f42fa398b Author: Bram Moolenaar <Bram@vim.org> Date: Sun Dec 13 17:50:20 2020 +0100 patch 8.2.2138: Vim9: "exit_cb" causes Vim to exit Problem: Vim9: "exit_cb" causes Vim to exit. Solution: Require white space after a command in Vim9 script. (closes https://github.com/vim/vim/issues/7467) Also fix that Vim9 style heredoc was not always recognized.