# Buggy code
def match(
    cls,
    segments,
    match_depth=0,
    parse_depth=0,
    verbosity=0,
    dialect=None,
    match_segment=None,
):
    """NamedSegment implements it's own matching function,
    we assume that ._template is the `name` of a segment"""
    # If we've been passed the singular, make it a list
    if isinstance(segments, BaseSegment):
        segments = [segments]

    # We only match on the first element of a set of segments
    if len(segments) >= 1:
        s = segments[0]
        if not cls._case_sensitive:
            n = s.name.upper()
        else:
            n = s.name
        logging.debug(
            "[PD:{0} MD:{1}] (KW) {2}.match considering {3!r} against {4!r}".format(
                parse_depth, match_depth, cls.__name__, n, cls._template
            )
        )
        if cls._template == n:
            m = (cls(raw=s.raw, pos_marker=segments[0].pos_marker),)  # Return a tuple
            return MatchResult(m, segments[1:])
    else:
        logging.debug(
            "{1} will not match sequence of length {0}".format(
                len(segments), cls.__name__
            )
        )
    return MatchResult.from_unmatched(segments)


# 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):
    """NamedSegment implements it's own matching function,
    we assume that ._template is the `name` of a segment"""
    # If we've been passed the singular, make it a list
    if isinstance(segments, BaseSegment):
        segments = [segments]

    # We only match on the first element of a set of segments
    if len(segments) >= 1:
        s = segments[0]
        if not cls._case_sensitive:
            n = s.name.upper()
        else:
            n = s.name
        logging.debug(
            "[PD:{0} MD:{1}] (KW) {2}.match considering {3!r} against {4!r}".format(
                parse_context.parse_depth,
                parse_context.match_depth,
                cls.__name__,
                n,
                cls._template,
            )
        )
        if cls._template == n:
            m = (cls(raw=s.raw, pos_marker=segments[0].pos_marker),)  # Return a tuple
            return MatchResult(m, segments[1:])
    else:
        logging.debug(
            "{1} will not match sequence of length {0}".format(
                len(segments), cls.__name__
            )
        )
    return MatchResult.from_unmatched(segments)