patch 8.2.1686: Vim9: "const!" not sufficiently tested Commit: https://github.com/vim/vim/commit/71abe4828974af495602ffaff63cf643a16de84b Author: Bram Moolenaar <Bram@vim.org> Date: Mon Sep 14 22:28:30 2020 +0200 patch 8.2.1686: Vim9: "const!" not sufficiently tested Problem: Vim9: "const!" not sufficiently tested. Solution: Add a few more test cases. Fix type checking.

" Simplistic way to make spaces and Tabs visible

" This can be added to an already active syntax.

syn match Space " "
syn match Tab "\t"
if &background == "dark"
  hi def Space ctermbg=darkred guibg=#500000
  hi def Tab ctermbg=darkgreen guibg=#003000
else
  hi def Space ctermbg=lightred guibg=#ffd0d0
  hi def Tab ctermbg=lightgreen guibg=#d0ffd0
endif