# Buggy code
def _match(
    cls,
    segments,
    match_depth=0,
    parse_depth=0,
    verbosity=0,
    dialect=None,
    match_segment=None,
):
    """A wrapper on the match function to do some basic validation and logging"""
    parse_match_logging(
        parse_depth,
        match_depth,
        match_segment,
        cls.__name__,
        "_match",
        "IN",
        verbosity=verbosity,
        v_level=4,
        ls=len(segments),
    )

    if isinstance(segments, BaseSegment):
        segments = (segments,)  # Make into a tuple for compatability

    if not isinstance(segments, tuple):
        logging.warning(
            "{0}.match, was passed {1} rather than tuple or segment".format(
                cls.__name__, type(segments)
            )
        )
        if isinstance(segments, list):
            # Let's make it a tuple for compatibility
            segments = tuple(segments)

    if len(segments) == 0:
        logging.info(
            "{0}._match, was passed zero length segments list".format(cls.__name__)
        )

    m = cls.match(
        segments,
        match_depth=match_depth,
        parse_depth=parse_depth,
        verbosity=verbosity,
        dialect=dialect,
        match_segment=match_segment,
    )

    if not isinstance(m, tuple) and m is not None:
        logging.warning(
            "{0}.match, returned {1} rather than tuple".format(cls.__name__, type(m))
        )

    parse_match_logging(
        parse_depth,
        match_depth,
        match_segment,
        cls.__name__,
        "_match",
        "OUT",
        verbosity=verbosity,
        v_level=4,
        m=m,
    )
    # Basic Validation
    check_still_complete(segments, m.matched_segments, m.unmatched_segments)
    return m


# Traceback (TypeError)
Traceback (most recent call last):
File "/home/user/sql/.venv/bin/sqlfluff", line 11, in <module>
load_entry_point('sqlfluff==0.1.3', 'console_scripts', 'sqlfluff')()
File "/home/user/sql/.venv/lib/python3.7/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/home/user/sql/.venv/lib/python3.7/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/home/user/sql/.venv/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/user/sql/.venv/lib/python3.7/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/user/sql/.venv/lib/python3.7/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/cli/commands.py", line 85, in lint
result = lnt.lint_paths(paths, verbosity=verbose)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/linter.py", line 324, in lint_paths
result.add(self.lint_path(path, verbosity=verbosity, fix=fix))
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/linter.py", line 312, in lint_path
linted_path.add(self.lint_file(f, fname=fname, verbosity=verbosity, fix=fix))
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/linter.py", line 212, in lint_file
parsed, vs, time_dict = self.parse_file(f=f, fname=fname, verbosity=verbosity)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/linter.py", line 193, in parse_file
parsed = fs.parse(recurse=recurse, verbosity=verbosity, dialect=self.dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 228, in parse
verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 394, in expand
res = stmt.parse(recurse=recurse, parse_depth=parse_depth, verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 228, in parse
verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 394, in expand
res = stmt.parse(recurse=recurse, parse_depth=parse_depth, verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 228, in parse
verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 394, in expand
res = stmt.parse(recurse=recurse, parse_depth=parse_depth, verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 228, in parse
verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 394, in expand
res = stmt.parse(recurse=recurse, parse_depth=parse_depth, verbosity=verbosity, dialect=dialect)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 186, in parse
dialect=dialect, match_segment=self.__class__.__name__)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 70, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 273, in match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 70, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 485, in match
match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 70, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 273, in match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 70, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 236, in match
dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 361, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/segments_base.py", line 320, in match
dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 70, in _match
verbosity=verbosity, dialect=dialect, match_segment=match_segment)
File "/home/user/sql/.venv/lib/python3.7/site-packages/sqlfluff/parser/grammar.py", line 586, in match
segment=segments[start_bracket_idx])
TypeError: tuple indices must be integers or slices, not NoneType

# Fixed code
def _match(cls, segments, parse_context):
    """A wrapper on the match function to do some basic validation and logging"""
    parse_match_logging(
        cls.__name__,
        "_match",
        "IN",
        parse_context=parse_context,
        v_level=4,
        ls=len(segments),
    )

    if isinstance(segments, BaseSegment):
        segments = (segments,)  # Make into a tuple for compatability

    if not isinstance(segments, tuple):
        logging.warning(
            "{0}.match, was passed {1} rather than tuple or segment".format(
                cls.__name__, type(segments)
            )
        )
        if isinstance(segments, list):
            # Let's make it a tuple for compatibility
            segments = tuple(segments)

    if len(segments) == 0:
        logging.info(
            "{0}._match, was passed zero length segments list".format(cls.__name__)
        )

    m = cls.match(segments, parse_context=parse_context)

    if not isinstance(m, tuple) and m is not None:
        logging.warning(
            "{0}.match, returned {1} rather than tuple".format(cls.__name__, type(m))
        )

    parse_match_logging(
        cls.__name__, "_match", "OUT", parse_context=parse_context, v_level=4, m=m
    )
    # Basic Validation
    check_still_complete(segments, m.matched_segments, m.unmatched_segments)
    return m