patch 8.2.1247: Vim9: cannot index a character in a string Commit: https://github.com/vim/vim/commit/bf9d8c3765a5255c0a0b577ca2e25d70a8bcb688 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 19 17:55:44 2020 +0200 patch 8.2.1247: Vim9: cannot index a character in a string Problem: Vim9: cannot index a character in a string. Solution: Add ISN_STRINDEX instruction. (closes https://github.com/vim/vim/issues/6478)