Provide a better folding for haskell file. The folded lines are transformed to display the type signature (if any) of the function, providing a great overview of your file content.
You can get a shorter version of the foldtext (only the first relevant line)
by setting g:haskellFold_ShortText = 1
Drop the file in ~/.vim/plugin or ~/vimfiles/plugin folder, or if you use pathogen into the ~/.vim/bundle/vim-haskellFold or ~/vimfiles/bundle/vim-haskellFold