trait EventReceiverObject {
    fn event(&self, e: i32);
}

struct MyObject {}

impl EventReceiverObject for MyObject {
    fn event(&self, e: i32) {
        println!("Handling event {}", e);
    }
}

fn main() {
    use std::rc::Rc;
    let a = Rc::new(MyObject {});
    let b: Rc<dyn EventReceiverObject> = a;

    println!("Hello, world!");
}