Rect = {
  x = 0,
  y = 0,
  width = 10,
  height = 20,
}

function Rect:area()
  return self.width * self.height
end

function Rect:new()
  o = {}
  o.x = self.x;
  o.y = self.y;
  o.width = self.width;
  o.height = self.height;
  o.area = self.area;
  return o
end

ex1 = "print(Rect:area()); r2 = Rect:new(); r2.width = 1 ; print(r2:area()); print(Rect:area())"

f = loadstring(ex1)

f()