How do you actually use dynamically sized types in Rust?

Question

In theory, Dynamically-Sized Types (DST) have landed and we should now be able to use dynamically sized type instances. Practically speaking, I can neither make it work, nor

Answer 1

To amend the example that Paolo Falabella has given, here is a different way of looking at it with the use of a property.

struct Foo<'a, T>
where
    T: 'a + ?Sized,
{
    printable_object: &'a T,
}

impl<'a, T> Print for Foo<'a, T>
where
    T: 'a + ?Sized + fmt::Display,
{
    fn print(&self) {
        println!("{}", self.printable_object);
    }
}

fn main() {
    let h = Foo {
        printable_object: "hello",
    };
    h.print();
}