Provide debuggers with a way to know that a function is exiting with an unhandled exception.

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-07-11.18:07:01.401>
labels = ['interpreter-core', 'type-feature', '3.8']
title = 'Provide debuggers with a way to know that a function is exiting with an unhandled exception.'
updated_at = <Date 2018-07-11.19:39:46.100>
user = 'https://github.com/fabioz'

bugs.python.org fields:

activity = <Date 2018-07-11.19:39:46.100>
actor = 'eric.snow'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2018-07-11.18:07:01.401>
creator = 'fabioz'
dependencies = []
files = []
hgrepos = []
issue_num = 34099
keywords = []
message_count = 1.0
messages = ['321492']
nosy_count = 2.0
nosy_names = ['fabioz', 'eric.snow']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue34099'
versions = ['Python 3.8']