<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _custom_token_stream(self):
 """ A wrapper for the BaseEnamlLexer's make_token_stream which allows the stream to be customized by adding "token_stream_processors". A token_stream_processor is a generator function which takes the token_stream as it's single input argument and yields each processed token as it's output. Each token will be an instance of `ply.lex.LexToken`. """

    token_stream = default_make_token_stream(self)
    for processor in _token_stream_processors:
        token_stream = processor(token_stream)
    return token_stream