the constant functor

[Tobias Haeberlein]

I am trying to make all polynomial functors (in the
categorical sense) an instance of the class Functor.

Consider a datatype (corresponsing to a constant functor):

  data ConstInt a = Const Int

ConstInt is clearly a functor in the categorical sense, 
but is 'ConstInt' also a functor in Haskell?? 

Any ideas how to make 'ConstInt' an instance of class Functor?


-Tobi

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