IDLE: make use of extended error info.

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2022-03-29.22:10:53.350>
labels = ['expert-IDLE', '3.10', '3.11']
title = 'IDLE: make use of extended SyntaxError info.'
updated_at = <Date 2022-03-30.00:59:30.437>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2022-03-30.00:59:30.437>
actor = 'aroberge'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2022-03-29.22:10:53.350>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 47156
keywords = []
message_count = 2.0
messages = ['416302', '416315']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'aroberge']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue47156'
versions = ['Python 3.10', 'Python 3.11']