Bug TestFunction {
    var size
    size = 20
    x= 0
    y = 0
    color blue
    do drawSquare(size)
    x = 40
    y = 40
    size = drawSquare(size)
    x = 30
    y = 30
    size = drawSquare(size)
    
    define drawSquare using size {
         move size
         turn -90
         move size
         turn -90
         move size
         turn -90
         move size
         turn -90
         return size + 20
    }
}