old_contents: print(list(zip()))
  print(list(zip([1], {2,3})))
  
new_contents: try:
      zip
      set
  except NameError:
      print("SKIP")
      import sys
      sys.exit()
  
  print(list(zip()))
  print(list(zip([1], set([2, 3]))))
  
subject: Make skippable.