old_contents: """
  Implementation of the command-line I{pyflakes} tool.
  """
  from __future__ import absolute_import
  
  # For backward compatibility
  from pyflakes.api import check, checkPath, checkRecursive, iterSourceCode, main
  
new_contents: """
  Implementation of the command-line I{pyflakes} tool.
  """
  from __future__ import absolute_import
  
  # For backward compatibility
  __all__ = ['check', 'checkPath', 'checkRecursive', 'iterSourceCode', 'main']
  from pyflakes.api import check, checkPath, checkRecursive, iterSourceCode, main
  
subject: Fix warnings.