old_contents: # encoding=UTF-8
  
  # Copyright © 2011-2016 Jakub Wilk <jwilk@jwilk.net>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the “Software”), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  '''
  pydiatra: helper functions for AST manipulation
  '''
  
  import sys
  
  if sys.version_info >= (3, 2):
      import tokenize
      python_open = tokenize.open
      del tokenize
  elif sys.version_info >= (3,):
      import py_compile
      def python_open(filename, read_encoding=py_compile.read_encoding):
          encoding = read_encoding(filename, 'utf-8')
          return open(filename, 'rU', encoding=encoding)
      del py_compile
  else:
      def python_open(filename):
          return open(filename, 'rU')
  
  # vim:ts=4 sts=4 sw=4 et
  
new_contents: # encoding=UTF-8
  
  # Copyright © 2011-2016 Jakub Wilk <jwilk@jwilk.net>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the “Software”), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  '''
  pydiatra: helper functions for AST manipulation
  '''
  
  import sys
  
  if sys.version_info >= (3, 2):
      import tokenize
      python_open = tokenize.open
      del tokenize
  elif sys.version_info >= (3,):
      import py_compile
      def python_open(filename, read_encoding=py_compile.read_encoding):
          encoding = read_encoding(filename, 'utf-8')
          return open(filename, 'rU', encoding=encoding)
      del py_compile
  else:
      def python_open(filename):
          return open(filename, 'rU')
  
  __all__ = [
      'python_open',
  ]
  
  # vim:ts=4 sts=4 sw=4 et
  
subject: add __all__.