class MyClass {
  def MyClass()
  {
  }

  def mult(double d) {
    this.y * d
  }
};

var o = MyClass();
o.f = fun(x,y) { x * y; }
assert_true(o.f(3,4) == 12);

o.f2 = fun(x) { x * 3; }
assert_true(o.f2(3) == 9);

o.y = 15;
o.f3 = fun(x) { x * this.y; }
assert_true(o.f3(4) == 60);

assert_true(o.mult(3.0) == 45.0);


var o2 = Dynamic_Object();
o2.a = 15
assert_true(o2.a == 15)

assert_true(o2["a"] == 15)