On Thu, Oct 27, 2011 at 5:55 AM, Captain Freako <capn.freako@gmail.com> wrote:

SF.hs:11:10: `>>>' is not a (visible) method of class `Arrow'
Failed, modules loaded: none.

import Prelude hiding ((.),id)

import Control.Category

you'll also need to define `instance Category SF`, since that is a requirement for Arrows.