How to use the argcomplete.debug function in argcomplete

##############################
            # completions = self._get_completions(comp_words, cword_prefix, cword_prequote, last_wordbreak_pos)

            # capture stdout from the autocompleter
            result = StringIO()
            with redirect_stdout(result):
                completions = completer.complete_command(tokens, tokens[-1], comp_line, begidx, endidx)
            outstr = result.getvalue()

            if completions:
                # If any completion has a space in it, then quote all completions
                # this improves the user experience so they don't nede to go back and add a quote
                if ' ' in ''.join(completions):
                    completions = ['"{}"'.format(entry) for entry in completions]

                argcomplete.debug("\nReturning completions:", completions)

                output_stream.write(ifs.join(completions).encode(argcomplete.sys_encoding))
            elif outstr:
                # if there are no completions, but we got something from stdout, try to print help
                # trick the bash completion into thinking there are 2 completions that are unlikely
                # to ever match.

                comp_type = int(os.environ["COMP_TYPE"])
                if comp_type == 63:  # type is 63 for second tab press
                    print(outstr.rstrip(), file=argcomplete.debug_stream, end='')

                if completions is not None:
                    output_stream.write(ifs.join([ifs, ' ']).encode(argcomplete.sys_encoding))
                else:
                    output_stream.write(ifs.join([]).encode(argcomplete.sys_encoding))
            else:

validator=validator, print_suppressed=print_suppressed)

            if "_ARGCOMPLETE" not in os.environ:
                # not an argument completion invocation
                return

            try:
                argcomplete.debug_stream = os.fdopen(9, "w")
            except IOError:
                argcomplete.debug_stream = sys.stderr

            if output_stream is None:
                try:
                    output_stream = os.fdopen(8, "wb")
                except IOError:
                    argcomplete.debug("Unable to open fd 8 for writing, quitting")
                    exit_method(1)

            ifs = os.environ.get("_ARGCOMPLETE_IFS", "\013")
            if len(ifs) != 1:
                argcomplete.debug("Invalid value for IFS, quitting [{v}]".format(v=ifs))
                exit_method(1)

            comp_line = os.environ["COMP_LINE"]
            comp_point = int(os.environ["COMP_POINT"])

            comp_line = argcomplete.ensure_str(comp_line)

            ##############################
            # SWAPPED FOR AUTOCOMPLETER
            #
            # Replaced with our own tokenizer function

try:
                argcomplete.debug_stream = os.fdopen(9, "w")
            except IOError:
                argcomplete.debug_stream = sys.stderr

            if output_stream is None:
                try:
                    output_stream = os.fdopen(8, "wb")
                except IOError:
                    argcomplete.debug("Unable to open fd 8 for writing, quitting")
                    exit_method(1)

            ifs = os.environ.get("_ARGCOMPLETE_IFS", "\013")
            if len(ifs) != 1:
                argcomplete.debug("Invalid value for IFS, quitting [{v}]".format(v=ifs))
                exit_method(1)

            comp_line = os.environ["COMP_LINE"]
            comp_point = int(os.environ["COMP_POINT"])

            comp_line = argcomplete.ensure_str(comp_line)

            ##############################
            # SWAPPED FOR AUTOCOMPLETER
            #
            # Replaced with our own tokenizer function
            ##############################
            tokens, _, begidx, endidx = tokens_for_completion(comp_line, comp_point)

            # _ARGCOMPLETE is set by the shell script to tell us where comp_words
            # should start, based on what we're completing.