parser crashes with comment at beginning of file

Using latest version from master

test.sql

-- comment at beginning of file
select * from my_table

Last part of traceback

  File "...\.venv\src\sqlfluff\src\sqlfluff\rules\std.py", line 1760, in _eval
    if last_seg.type == 'comma':
AttributeError: 'NoneType' object has no attribute 'type'

Problem persists even with block /**/ comment

[pwildenhain]

Interesting! Would you mind trying with the pre release version? pip install sqlfluff --pre

[davehowell]

Tried with the pre, different error, and it happens twice for the same rule in the same code-path:

sqlfluff/core/rules/std.py", line 2133, in _last_code_seg
    if raw_stack[idx].is_code or raw_stack[idx].is_type("newline"):
IndexError: tuple index out of range
== [models/staging/test.sql] FAIL
L:   1 | P:  37 | L019 | Unexpected exception: tuple index out of range; Could you open an
                       | issue at https://github.com/sqlfluff/sqlfluff/issues ? You can
                       | ignore this exception for now, by adding '--noqa: L019' at the end
                       | of line 1
L:   2 | P:   1 | L019 | Unexpected exception: tuple index out of range; Could you open an
                       | issue at https://github.com/sqlfluff/sqlfluff/issues ? You can
                       | ignore this exception for now, by adding '--noqa: L019' at the end
                       | of line 2