Complete the following instance declaration to make the partially-applied function type (a →) in

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First, let's write down the type of fmap for the partially-applied function type $(a rightarrow)

Complete the following instance declaration to make the partially-applied function type $(a \rightarrow)$ into a functor: instance Functor $((->)$ a) where Hint: first write down the type of fmap, and then think if you already know a library function that has this type.