old_contents: # test builtin slice
  
  # print slice
  class A:
      def __getitem__(self, idx):
          print(idx)
  A()[1:2:3]
  
new_contents: # test builtin slice
  
  # print slice
  class A:
      def __getitem__(self, idx):
          print(idx)
          return idx
  s = A()[1:2:3]
  
  # check type
  print(type(s) is slice)
  
subject: Add test for "slice" builtin name.