old_contents: def f(a):
      return ++a
  
  def g(a):
      return +a
  
  def g(a):
      return --a
  
new_contents: def f(a):
      return ++a
  
  def g(a):
      return +a
  
  def g(a):
      return --a
  
  def foo():
      if 1 == None:
          print "whoa!"
      else:
          print "whew!"
  
      if None == 1:
          print "whoa!"
      else:
          print "whew!"
  
subject: add comparison check for add test for "== None"