struct Thing<'a> {
    thing_type: &'a ThingType,
}

struct ThingType {
    id: u32,
}

fn deserialize_thing<'a>(id: u32) -> Thing<'a> {
    // The function will own the value referred to by `thing_type`
    let thing_type = ThingType { id: id };

    Thing { thing_type: &thing_type }

    // thing_type goes out of scope and its value is dropped, but a `Thing` that
    // refers to it was returned. Hence we get a compiler error.
}

fn main() {
    let thing = deserialize_thing(42);
}