Apologies, I think I made a mistake in the original posting.

Line "syn region CursorLine start ..."
should read
syn region CursorLine start="-\s*\([!].*\)\=$" end="\<" contains=Comment

It is possible that it worked with the version of vim I used at the time.

I took the liberty of modifying the latest posted version accordingly.

A.

Attached Images
vim_syntax.zip (1.81 KB, 634 downloads)