#!/usr/bin/lua
local point= require "point"

-- ...

local mp= point.new_MovablePoint(5,6)
mp.x= 9     --> Write access throws an error
print(mp.y) --> Read access throws an error
print(mp:tostring()) --> [5|6]
mp:move(2,1)
print(mp:tostring()) --> [7|7]
print_r(mp)          --> prints nothing