Chapter 9 Listing 9.7

when setposition is called to restore the turtle's position and heading to a previously stored location, the tail should be up. so Lines 16 and following should read:

        elif cmd == ']':
            pos,head = stateSaver.pop()
            aTurtle.up()
            aTurtle.setposition(pos)
            aTurtle.setheading(head)
            aTurtle.down()