dyn Trait + OtherTrait

dyn_trait_plus_other_trait.rs

use std::fmt::Debug;

trait MyTrait: Debug {
    fn m(&self);
}

#[derive(Debug)]
struct Foo;

impl MyTrait for Foo {
    fn m(&self) {}
}

impl MyTrait for Box<dyn MyTrait> {
    fn m(&self) {
        (**self).m()
    }
}

fn main() {
    let boxed_foo: Box<dyn MyTrait> = Box::new(Foo);
    println!("{:?}", boxed_foo);
}