old_contents: foo = ['a', 'b', 'c',]
  
  bar = { a: b,}
  
  def bah(ham, spam,):
      pass
  
  (0,)
  
  (0, 1,)
  
  foo = ['a', 'b', 'c', ]
  
  bar = { a: b, }
  
  def bah(ham, spam, ):
      pass
  
  (0, )
  
  (0, 1, )
  
new_contents: foo = ['a', 'b', 'c',]
  
  bar = { a: b,}
  
  def bah(ham, spam,):
      pass
  
  (0,)
  
  (0, 1,)
  
  foo = ['a', 'b', 'c', ]
  
  bar = { a: b, }
  
  def bah(ham, spam, ):
      pass
  
  (0, )
  
  (0, 1, )
  
  image[:, :, 0]
  
  image[:,]
  
  image[:,:,]
  
subject: add test cases for prohibited comma false positives in subscript