Function apply

pub fn apply<Brand, F, A, B>(
    ff: Apply<Brand, (F,)>,
) -> impl Fn(Apply<Brand, (A,)>) -> Apply<Brand, (B,)>
where
    Brand: Kind<(F,)> + Kind<(A,)> + Kind<(B,)> + Apply,
    Apply<Brand, (F,)>: Clone,
    F: Fn(A) -> B,
    A: Clone,

forall a b. Apply f => f (a -> b) -> f a -> f b