File: upcast.rs

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//@ known-bug: #104800

#![feature(dyn_star, trait_upcasting)]

trait Foo: Bar {
    fn hello(&self);
}

trait Bar {
    fn world(&self);
}

struct W(usize);

impl Foo for W {
    fn hello(&self) {
        println!("hello!");
    }
}

impl Bar for W {
    fn world(&self) {
        println!("world!");
    }
}

fn main() {
    let w: dyn* Foo = W(0);
    w.hello();
    let w: dyn* Bar = w;
    w.world();
}