Clone from raphael-proust/ocaml_lwt.vim
Clone the bondi.vim file into ~/.vim/syntax/. Then stick these of lines into your .vimrc (this file has to be placed in home directory)
au BufRead,BufNewFile *.bon set filetype=bondi
au! Syntax bondi source ~/.vim/syntax/bondi.vim
autocmd Syntax bondi set commentstring=(*%s*)