dev/vala/gvala/main.vala

class GVala : GLib.Object {
  public static int main (string[] args) {
    var src = new SubSub();
    src.b = 1;
    src.s = 2;
    src.ss = 3;

    Base b = new SubSub();
    b = src.clone();

    var ss = (SubSub) b;

    stdout.printf ("b = %d, s = %d, ss = %d\n", ss.b, ss.s, ss.ss);

    return 0;
  }
}