patch 8.2.3239: Vim9: no error using heredoc for a number variable Commit: https://github.com/vim/vim/commit/81530e36033dec2c2cd94af6dd48ceb0389e95a2 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jul 28 21:25:49 2021 +0200 patch 8.2.3239: Vim9: no error using heredoc for a number variable Problem: Vim9: no error using heredoc for a number variable. Solution: Add a type check. (closes https://github.com/vim/vim/issues/8627)

" 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