patch 8.2.2173: Vim9: get internal error when assigning to undefined variable Commit: https://github.com/vim/vim/commit/52c124d3303d3cc3e4504708881906d17d6d6c55 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Dec 20 21:43:35 2020 +0100 patch 8.2.2173: Vim9: get internal error when assigning to undefined variable Problem: Vim9: get internal error when assigning to undefined variable. Solution: Add error message. (closes https://github.com/vim/vim/issues/7475)

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