new_contents: #!/usr/bin/env python3
  # Copyright (c) 2017 The lit developers
  # Distributed under the MIT software license, see the accompanying
  # file LICENSE or http://www.opensource.org/licenses/mit-license.php.
  """Utils for lit testing"""
  
  def assert_equal(thing1, thing2, *args):
      if thing1 != thing2 or any(thing1 != arg for arg in args):
          raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
  
subject: add assert_equal() util function