Display exit-codes for abruptly terminated processes in concurrent.futures

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-06-26.05:18:59.747>
labels = ['type-feature', 'library', '3.10']
title = 'Display exit-codes for abruptly terminated processes in concurrent.futures'
updated_at = <Date 2020-06-26.07:25:13.866>
user = 'https://github.com/EpicWink'

bugs.python.org fields:

activity = <Date 2020-06-26.07:25:13.866>
actor = 'Epic_Wink'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-06-26.05:18:59.747>
creator = 'Epic_Wink'
dependencies = []
files = []
hgrepos = []
issue_num = 41125
keywords = ['patch']
message_count = 1.0
messages = ['372409']
nosy_count = 1.0
nosy_names = ['Epic_Wink']
pr_nums = ['21166']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41125'
versions = ['Python 3.10']