3DRaven

pub struct GenericId<T>(pub i64, pub PhantomData<T>);

pub struct PhantomMyId;
pub type MyId = GenericId<PhantomMyId>;
pub struct PhantomOtherId;
pub type OtherId = GenericId<PhantomOtherId>;


pub fn foo(my_id: &amp;MyId){

3DRaven

public class Person {
    private final String username;
    private final int age;

    Person(PersonBuilder personBuilder) {
        this.username = personBuilder.username;
        this.age = personBuilder.age;
    }