patch 8.2.2951: Vim9: cannot use heredoc for :python, :lua, etc. Commit: https://github.com/vim/vim/commit/2067733b5c76e996238af938af36b8196366b7ce Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 6 17:02:53 2021 +0200 patch 8.2.2951: Vim9: cannot use heredoc for :python, :lua, etc. Problem: Vim9: cannot use heredoc in :def function for :python, :lua, etc. Solution: Concatenate the heredoc lines and pass them in the ISN_EXEC_SPLIT instruction.