Implicit ABCs have no means of "anti-registration"

abarnert

BPO	25958
Nosy	@gvanrossum, @rhettinger, @ncoghlan, @ethanfurman, @vadmium, @serhiy-storchaka, @ilevkivskyi, @Mariatta
Files	patch.diff patch-regenerated.diff patch2.diff patch3.diff patch3-regenerated.diff patch4a.diff patch5.diff abarnert_rebased.diff abarnert_rebased2.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-08-18.19:16:27.926>
created_at = <Date 2015-12-26.22:26:42.809>
labels = ['type-feature', 'library']
title = 'Implicit ABCs have no means of "anti-registration"'
updated_at = <Date 2017-06-10.03:39:41.507>
user = 'https://bugs.python.org/abarnert'

bugs.python.org fields:

activity = <Date 2017-06-10.03:39:41.507>
actor = 'Mariatta'
assignee = 'none'
closed = True
closed_date = <Date 2016-08-18.19:16:27.926>
closer = 'gvanrossum'
components = ['Library (Lib)']
creation = <Date 2015-12-26.22:26:42.809>
creator = 'abarnert'
dependencies = []
files = ['41502', '41508', '41509', '41511', '41519', '41527', '41651', '44122', '44123']
hgrepos = []
issue_num = 25958
keywords = ['patch']
message_count = 46.0
messages = ['257052', '257056', '257059', '257129', '257277', '257295', '257303', '257305', '257481', '257490', '257491', '257512', '257518', '257523', '257538', '257542', '257543', '257544', '257546', '257548', '257549', '257550', '257551', '257555', '257559', '257564', '257576', '257636', '257639', '257641', '257790', '258539', '259346', '259350', '259351', '259355', '259357', '270439', '272800', '272801', '273041', '273047', '273048', '273051', '295540', '295602']
nosy_count = 10.0
nosy_names = ['gvanrossum', 'rhettinger', 'ncoghlan', 'ethan.furman', 'python-dev', 'martin.panter', 'serhiy.storchaka', 'abarnert', 'levkivskyi', 'Mariatta']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue25958'
versions = ['Python 3.6']