[Haskell-cafe] On to applicative

michael rice nowgate at yahoo.com
Sat Aug 28 20:43:52 EDT 2010

I'm looking at a discussion of Either (as functor) here:


instance Functor (Either a) where  
    fmap f (Right x) = Right (f x)  
    fmap f (Left x) = Left x

And this line in Data.Either

Functor (Either a)

but no fmap defined here.

How come?


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