Proposal: Data.Functor.<.> for `fmap f2 . f1`

[Phil Scott]

That should just be (fmap.fmap).

> I don't know if "I find this very useful" is enough for adding a function to
> base, but here it goes:
>
>     infixl 4 <.>
>     (<.>) :: Functor f => (b -> c) -> (a -> f b) -> (a -> f c)
>     f1 <.> f2 = fmap f1 . f2
>     {-# INLINE (<.>) #-}
>
> I first defined this couple of months ago and I find myself looking for this
> function all the time now.
>
> One problem with this is that the name is used by widely used `filepath`
> library.
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