parser.st2list(..., col_info=True) triggers a SystemError

BPO	33308
Nosy	@brettcannon, @serhiy-storchaka, @miss-islington
PRs	bpo-33308: Fix a crash in the parser module when convert an ST object. #6519 [3.7] bpo-33308: Fix a crash in the parser module when convert an ST object. (GH-6519) #6526 [3.6] bpo-33308: Fix a crash in the parser module when convert an ST object. (GH-6519) #6527 [2.7] bpo-33308: Fix a crash in the parser module when convert an ST object. (GH-6519) #6532

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2018-04-19.06:17:16.943>
created_at = <Date 2018-04-18.15:32:25.993>
labels = ['extension-modules', '3.7', '3.8', 'type-crash']
title = 'parser.st2list(..., col_info=True) triggers a SystemError'
updated_at = <Date 2018-04-19.06:17:16.942>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2018-04-19.06:17:16.942>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2018-04-19.06:17:16.943>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2018-04-18.15:32:25.993>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 33308
keywords = ['patch']
message_count = 5.0
messages = ['315455', '315468', '315475', '315476', '315480']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'serhiy.storchaka', 'miss-islington']
pr_nums = ['6519', '6526', '6527', '6532']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue33308'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']