gistfile1.txt

class B {
    underridable void f() {
        println("B::f");
        derived(); // calls more derived implementation of f
    }
}
class D : B {
    underride void f() {
        println("D::f");
    }
}
let x = new D();
x.f(); // calls least derived implementation of f; so prints B::f then D::f