ast module classes missing __text_signature__ attribute

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-09-27.15:48:43.313>
labels = ['interpreter-core', 'type-feature', 'library', 'expert-argument-clinic', '3.11']
title = 'ast module classes missing __text_signature__ attribute'
updated_at = <Date 2021-10-01.22:48:54.561>
user = 'https://github.com/xloem'

bugs.python.org fields:

activity = <Date 2021-10-01.22:48:54.561>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core', 'Library (Lib)', 'Argument Clinic']
creation = <Date 2021-09-27.15:48:43.313>
creator = 'xloem'
dependencies = []
files = []
hgrepos = []
issue_num = 45303
keywords = []
message_count = 2.0
messages = ['402728', '403040']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'larry', 'xloem']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45303'
versions = ['Python 3.11']