/usr/share/vim/vim74/syntax/whitespace.vim is in vim-runtime 2:7.4.1689-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | " 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
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