old_contents: # test handling of failed heap allocation with set
  
  import micropython
  
  # create set
  x = 1
  micropython.heap_lock()
  try:
      {x,}
  except MemoryError:
      print('MemoryError: set create')
  micropython.heap_unlock()
  
  # set copy
  s = {1, 2}
  micropython.heap_lock()
  try:
      s.copy()
  except MemoryError:
      print('MemoryError: set copy')
  micropython.heap_unlock()
  
new_contents: # test handling of failed heap allocation with set
  
  import micropython
  
  # create set
  x = 1
  micropython.heap_lock()
  try:
      {x}
  except MemoryError:
      print('MemoryError: set create')
  micropython.heap_unlock()
  
  # set copy
  s = {1, 2}
  micropython.heap_lock()
  try:
      s.copy()
  except MemoryError:
      print('MemoryError: set copy')
  micropython.heap_unlock()
  
subject: Remove extra trailing comma.