old_contents: import sys
  
  from .main import main
  
  if __name__ == '__main__':
      sys.exit(main())
  
new_contents: # -*- coding: utf-8 -*-
  # Licensed under a 3-clause BSD style license - see LICENSE.rst
  
  from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  import sys
  
  from .main import main
  
  if __name__ == '__main__':
      sys.exit(main())
  
subject: Add header stuff to asv/__main__.py