eval(readFile("Worlds_Compiled"))


w = new world
in w {
  0.fact      = function() { return 1 }
  number.fact = function() { return this * (this - 1).fact() }
}
0.fact
w.get(0, "fact")
w.get(5, "fact")
w.send(5, "fact")
w.call(function() { return 5.fact() })


w2 = w.call(function() { return new world })
in w2 {
  alert(5.fact())
}


worldProto.makeChild = function() { return this.call(function() { return new world }) }
w2 = w.makeChild()
...


w = new world
in w {
  node = {}

  lit = new node()
  lit.initialize = function(val) { this.val = val }

  binop = new node()
  binop.initialize = function(op, x, y) { this.op = op; this.x = x; this.y = y }

  expr = new binop("+", new lit(1), new binop("*", new lit(2), new lit(3)))
}


w2 = w.makeChild()
in w2 {
  node.printString  = function() { this.subclassResponsibility() }
  lit.printString   = function() { return this.val }
  binop.printString = function() { return "(" + this.x.printString() + this.op + this.y.printString() + ")" }

  expr2 = new binop("*", new lit(6), new lit(7))
  alert(expr.printString())
  alert(expr2.printString())
}