Clone Fn closure using Arc in rust lang

clone_fn_rust.rs

use std::sync::Arc;
use std::fmt;

type Fp = Box<Fn(i8, i8) -> i8 + Send + Sync>;

#[derive(Clone)]
struct WithCall {
    fp: Arc<Fp>,
}

impl WithCall {
    pub fn new(fp: Fp) -> WithCall {
        WithCall { fp: Arc::new(fp) }
    }

    pub fn run(&self, a: i8, b: i8) -> i8 {
        (*self.fp)(a, b)
    }
}

impl fmt::Display for WithCall {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Cloning ... your Fn closure. Done !!!")
    }
}

fn main() {
    let adder = WithCall::new(Box::new(|a: i8, b: i8| a + b));
    println!("Ran adder {}", adder.run(1, 2));
    let add_b = adder.clone();
    println!("{}", add_b);
    println!("Ran adder cloned {}", add_b.run(2, 4));
}