[Haskell-cafe] Are there arithmetic composition of functions?

[Chris Smith]

If you are willing to depend on a recent version of base where Num is no
longer a subclass of Eq and Show, it is also fine to do this:

instance Num a => Num (r -> a) where
    (f + g) x = f x + g x
    fromInteger = const . fromInteger

and so on.
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