#unittest {
	name: "Instance clone.";
	error: NONE;
	result: 300;
};

class Foo {
    var a;
}

func main() {
    var f = Foo();
    f.a = 100;
    
    var f2 = f.clone();
    f2.a = 200;
    
    return f.a + f2.a;
}