new_contents: # Basics
  a, b = 1, 2
  print(a, b)
  a, b = (1, 2)
  print(a, b)
  (a, b) = 1, 2
  print(a, b)
  (a, b) = (1, 2)
  print(a, b)
  
  # Tuples/lists are optimized
  a, b = [1, 2]
  print(a, b)
  [a, b] = 100, 200
  print(a, b)
  
  try:
      a, b, c = (1, 2)
  except ValueError:
      print("ValueError")
  try:
      a, b, c = [1, 2, 3, 4]
  except ValueError:
      print("ValueError")
  
  # Generic iterable object
  a, b, c = range(3)
  print(a, b, c)
  try:
      a, b, c = range(2)
  except ValueError:
      print("ValueError")
  try:
      a, b, c = range(4)
  except ValueError:
      print("ValueError")
  
subject: Add testcase for sequence unpacking.