patch 8.2.0298: Vim9 script: cannot start command with a string constant Commit: https://github.com/vim/vim/commit/0c6ceaf90389b41545d803458c4813013811c756 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Feb 22 18:36:32 2020 +0100 patch 8.2.0298: Vim9 script: cannot start command with a string constant Problem: Vim9 script: cannot start command with a string constant. Solution: Recognize expression starting with '('.

" 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