Compose function in Rust

compose.rs

use core::ops::{Add, Mul};
use core::marker::Copy;
use std::fmt::Display;

fn compose<X, Y, Z> (
    f: impl Fn(X) -> Y,
    g: impl Fn(Y) -> Z
) -> impl Fn(X) -> Z {
    move |x: X| g(f(x))
}

fn logfn<X: Display + Copy, Y: Display + Copy> (
    name: impl Display,
    func: impl Fn(X) -> Y
) -> impl Fn(X) -> Y {
    move |x: X| {
        let y = func(x);
        println!("> {} ({}) = {}", name, x, y);
        y
    }
}

fn double<X: Add + Copy> (x: X) -> X::Output {
    x + x
}

fn square<X: Mul + Copy> (x: X) -> X::Output {
    x * x
}

fn main () {
    let double_then_square = logfn("double_then_square", compose(
        logfn("double", double),
        logfn("square", square)
    ));
    
    println!("Result {}", double_then_square(3));
}