old_contents: # copyright 2003-2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
  # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
  #
  # This file is part of astroid.
  #
  # astroid is free software: you can redistribute it and/or modify it
  # under the terms of the GNU Lesser General Public License as published by the
  # Free Software Foundation, either version 2.1 of the License, or (at your
  # option) any later version.
  #
  # astroid is distributed in the hope that it will be useful, but
  # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  # for more details.
  #
  # You should have received a copy of the GNU Lesser General Public License along
  # with astroid. If not, see <http://www.gnu.org/licenses/>.
  #
  # The code in this file was originally part of logilab-common, licensed under
  # the same license.
  
  import sys
  
  import six
  
  
  def reraise(exception):
      '''Reraises an exception with the traceback from the current exception
      block.'''
      six.reraise(type(exception), exception, sys.exc_info()[2])
  
  
  class _Yes(object):
      """Special inference object, which is returned when inference fails."""
      def __repr__(self):
          return 'YES'
  
      def __getattribute__(self, name):
          if name == 'next':
              raise AttributeError('next method should not be called')
          if name.startswith('__') and name.endswith('__'):
              return super(_Yes, self).__getattribute__(name)
          return self
  
      def __call__(self, *args, **kwargs):
          return self
  
  
  YES = _Yes()
  
new_contents: # copyright 2003-2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
  # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
  #
  # This file is part of astroid.
  #
  # astroid is free software: you can redistribute it and/or modify it
  # under the terms of the GNU Lesser General Public License as published by the
  # Free Software Foundation, either version 2.1 of the License, or (at your
  # option) any later version.
  #
  # astroid is distributed in the hope that it will be useful, but
  # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  # for more details.
  #
  # You should have received a copy of the GNU Lesser General Public License along
  # with astroid. If not, see <http://www.gnu.org/licenses/>.
  #
  # The code in this file was originally part of logilab-common, licensed under
  # the same license.
  
  import sys
  
  import six
  
  
  def reraise(exception):
      '''Reraises an exception with the traceback from the current exception
      block.'''
      six.reraise(type(exception), exception, sys.exc_info()[2])
  
  
  @object.__new__
  class YES(object):
      """Special inference object, which is returned when inference fails."""
      def __repr__(self):
          return 'YES'
  
      def __getattribute__(self, name):
          if name == 'next':
              raise AttributeError('next method should not be called')
          if name.startswith('__') and name.endswith('__'):
              return object.__getattribute__(self, name)
          return self
  
      def __call__(self, *args, **kwargs):
          return self
  
subject: Use the object.__new__ decorator to create a singleton instance of the YES object.