[Haskell-cafe] Make a DSL serializable

Hi Café, I have a DSL like this: data Exp where OnEvent :: EventName -> (Int -> Exp) -> Exp (...) The "OnEvent" element carries a function (the handler to be called when the event happens), and that makes my DSL non showable/serializable. How could I fix that? This is a real handicap not to be able to serialize the state of my whole application because of that :) Thanks, Corentin