class Person{
	int age;
	Person(int a){
		age = a;
	}
}
Person operator + (Person p1, Person p2){
	Person pp = Person(p1.age+p2.age);
	return pp;
}

Person p1 = Person(10);
Person p2 = Person(20);
Person p3 = p1+p2;
println("p3.age="+p3.age);
assertEqual(p3.age, 30);