patch 9.0.0444: trying to declare g:variable gives confusing error Commit: https://github.com/vim/vim/commit/9510d22463055f56548ff461ccbc54caa1ba1a2f Author: Bram Moolenaar <Bram@vim.org> Date: Sun Sep 11 15:14:05 2022 +0100 patch 9.0.0444: trying to declare g:variable gives confusing error Problem: Trying to declare g:variable gives confusing error. Solution: Give a better error message. (closes https://github.com/vim/vim/issues/11108)

" 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