Function sequence

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

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