old_contents: 'd'
  
  def y(v):
    x = len(v)
    if x == 0 :
      return x
    else :
      return x - 1
  
new_contents: 'd'
  
  def x(v):
    count = 0
    if v != 0:
      return 1
    return count
  
  def y(v):
    x = len(v)
    if x == 0 :
      return x
    else :
      return x - 1
  
  
subject: add a little more testing to checking return type info