patch 8.2.0661: eval test is still old style Commit: https://github.com/vim/vim/commit/339d60c89bef0315343a6128a1b4826510b0efe4 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Apr 29 22:01:21 2020 +0200 patch 8.2.0661: eval test is still old style Problem: Eval test is still old style. Solution: Change into new style tests. (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/6009)

" 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