[Haskell-cafe] On to applicative

[michael rice]

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

http://learnyouahaskell.com/making-our-own-types-and-typeclasses#the-functor-typeclass

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?

Michael




      
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