[Haskell-cafe] OK, so this VIM thing -- how do I make it actually work?

[Marc Weber]

>    clearly.)  The problems I'm seeing are the ugly white-on-red for
>    underlines, the lack of any kind of differentiation for

Hi.

Sorry for this stupid question but have you tried :set nohlsearch?
Or /searchsomethingwhichdoesntexist<cr> ?

You can also put your cursor an those underlines and use

  :echo synIDattr(synID(line("."), col("."), 1), "name")

To get some more infromation about which syntax group is currently used there.
If you get the same result on the _ and on the character to the right I don't
think it's a bug but just the hlsearch feature

Marc