fn main(): i64 {
  let user = User{id: 4};
  let result = user.instance_method() + User::instance_method(user);
  return result;
}

type User struct {
    id: i64
}

type TestTrait trait {
    fn class_method(id: i64): Self;
    fn instance_method(self: Self): i64;
    fn default_impl(self: Self): i64;
}

impl TestTrait for User {
    fn class_method(id: i64): Self {
        return Self{id: id};
    }
    fn instance_method(self: Self): i64 {
        return self.id;
    }
    fn default_impl(self: Self): i64 {
        return self.instance_method();
    }
}