patch 8.1.1174: cannot build with Ruby 1.8 commit https://github.com/vim/vim/commit/8dc4c7292364d31cfb8afa8a67984b78b657b192 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 14 19:42:13 2019 +0200 patch 8.1.1174: cannot build with Ruby 1.8 Problem: Cannot build with Ruby 1.8. (Tom G. Christensen) Solution: Include ruby/st.h. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/4257)

" 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