[Haskell-cafe] Make a DSL serializable

[Corentin Dupont]

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
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