[Haskell-beginners] How do I give a type for this code?

[Daniel Trstenjak]

Hi Todd,

the problem is, that 'model_of' tries to return different types: Model a, Model (a,a) and Model [a].

I think you have to use some kind of ADT also for the Model, like you already did for ModName.

Something like:

   data Model a = Model a
                | ProductModel (a,a)
                | PowerModel [a]
                ...


Greetings,
Daniel