# Buggy code
def match(
    self,
    segments,
    match_depth=0,
    parse_depth=0,
    verbosity=0,
    dialect=None,
    match_segment=None,
):
    # Match on each of the options
    matched_segments = MatchResult.from_empty()
    unmatched_segments = segments
    n_matches = 0
    while True:
        if self.max_times and n_matches >= self.max_times:
            # We've matched as many times as we can
            return MatchResult(matched_segments.matched_segments, unmatched_segments)

        # Is there anything left to match?
        if len(unmatched_segments) == 0:
            # No...
            if n_matches >= self.min_times:
                return MatchResult(
                    matched_segments.matched_segments, unmatched_segments
                )
            else:
                # We didn't meet the hurdle
                return MatchResult.from_unmatched(unmatched_segments)

        # Is the next segment code?
        if self.code_only and not unmatched_segments[0].is_code:
            # We should add this one to the match and carry on
            matched_segments += (unmatched_segments[0],)
            unmatched_segments = unmatched_segments[1:]
            check_still_complete(
                segments, matched_segments.matched_segments, unmatched_segments
            )
            continue

        # Try the possibilities
        for opt in self._elements:
            m = opt._match(
                unmatched_segments,
                match_depth=match_depth + 1,
                parse_depth=parse_depth,
                verbosity=verbosity,
                dialect=dialect,
                match_segment=match_segment,
            )
            if m.has_match():
                matched_segments += m.matched_segments
                unmatched_segments = m.unmatched_segments
                n_matches += 1
                # Break out of the for loop which cycles us round
                break
        else:
            # If we get here, then we've not managed to match. And the next
            # unmatched segments are meaningful, i.e. they're not what we're
            # looking for.
            if n_matches >= self.min_times:
                return MatchResult(
                    matched_segments.matched_segments, unmatched_segments
                )
            else:
                # We didn't meet the hurdle
                return MatchResult.from_unmatched(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(self, segments, parse_context):
    # Match on each of the options
    matched_segments = MatchResult.from_empty()
    unmatched_segments = segments
    n_matches = 0
    while True:
        if self.max_times and n_matches >= self.max_times:
            # We've matched as many times as we can
            return MatchResult(matched_segments.matched_segments, unmatched_segments)

        # Is there anything left to match?
        if len(unmatched_segments) == 0:
            # No...
            if n_matches >= self.min_times:
                return MatchResult(
                    matched_segments.matched_segments, unmatched_segments
                )
            else:
                # We didn't meet the hurdle
                return MatchResult.from_unmatched(unmatched_segments)

        # Is the next segment code?
        if self.code_only and not unmatched_segments[0].is_code:
            # We should add this one to the match and carry on
            matched_segments += (unmatched_segments[0],)
            unmatched_segments = unmatched_segments[1:]
            check_still_complete(
                segments, matched_segments.matched_segments, unmatched_segments
            )
            continue

        # Try the possibilities
        for opt in self._elements:
            m = opt._match(
                unmatched_segments, parse_context=parse_context.copy(incr="match_depth")
            )
            if m.has_match():
                matched_segments += m.matched_segments
                unmatched_segments = m.unmatched_segments
                n_matches += 1
                # Break out of the for loop which cycles us round
                break
        else:
            # If we get here, then we've not managed to match. And the next
            # unmatched segments are meaningful, i.e. they're not what we're
            # looking for.
            if n_matches >= self.min_times:
                return MatchResult(
                    matched_segments.matched_segments, unmatched_segments
                )
            else:
                # We didn't meet the hurdle
                return MatchResult.from_unmatched(unmatched_segments)