// Example trait
trait MyTrait {
    fn foo(&self);
}

// Implementations of the trait for (i32, i32) and "str"
type MyType = (i32, i32);

impl MyTrait for MyType {
    fn foo(&self) {
        println!("{} {}", self.0, self.1);
    }
}

impl MyTrait for &'static str {
    fn foo(&self) {
        println!("{}", self);
    }
}

// Actual example how to avoid repeating Box::new or add_item()
fn show_all(mt: Vec<&dyn MyTrait>) {
    // List original
    for ref item in &mt {
        item.foo();
    }

    // Box all
    let mut boxed = Vec::new();
    for ref item in &mt {
        boxed.push(Box::new(*item));
    }

    // List boxed
    for ref item in &boxed {
        item.foo();
    }
}

// How to invoke.
fn main() {
    show_all(vec![
       &"test",
       &(1, 2),
       &"blah",
       &(5, 7),
    ]);
}