reserved identifier violation

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-01-06.12:13:12.672>
labels = ['interpreter-core', 'type-feature', '3.7']
title = 'reserved identifier violation'
updated_at = <Date 2019-01-08.16:20:40.046>
user = 'https://github.com/elfring'

bugs.python.org fields:

activity = <Date 2019-01-08.16:20:40.046>
actor = 'ronaldoussoren'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2019-01-06.12:13:12.672>
creator = 'elfring'
dependencies = []
files = []
hgrepos = []
issue_num = 35671
keywords = []
message_count = 6.0
messages = ['333105', '333121', '333172', '333173', '333182', '333234']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'vstinner', 'elfring']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35671'
versions = ['Python 3.7']