def _AddSlots(message_descriptor, dictionary):
dictionary['<STR_LIT>'] = ['<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>'<STR_LIT>']<EOL>
Adds a __slots__ entry to dictionary, containing the names of all valid
    attributes for this message type.

    Args:
      message_descriptor: A Descriptor instance describing this message type.
      dictionary: Class dictionary to which we'll add a '__slots__' entry.