patch 8.2.3031: no error if a function name starts with an underscore Commit: https://github.com/vim/vim/commit/22f17a29cd0b0cc3107dc6cd1d96c62eee52a7d9 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 21 20:48:58 2021 +0200 patch 8.2.3031: no error if a function name starts with an underscore Problem: No error if a function name starts with an underscore. (Naohiro Ono) Solution: In Vim9 script disallow a function name starting with an underscore, as is mentioned in the help. (closes #8414)

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