Function aviary::dovekie

pub fn dovekie<A: Clone, B, C, D, E, F, G, H>(
    f: F, 
    g: G, 
    x: A, 
    h: H
) -> impl Fn(B) -> E where
    F: Fn(C, D) -> E,
    G: Fn(A) -> C,
    H: Fn(B) -> D, 

D2 combinator