patch 8.2.3650: Vim9: for loop variable can be a list member Commit: https://github.com/vim/vim/commit/3b3755fe19e9ded2a1c45f14b2c6fa065bcaf2c6 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Nov 22 20:10:18 2021 +0000 patch 8.2.3650: Vim9: for loop variable can be a list member Problem: Vim9: for loop variable can be a list member. Solution: Check for valid variable name. (closes https://github.com/vim/vim/issues/9179)

import before_1
dir = '3'