Enforce PEP 479—StopIteration and generators—in Python 3.7 by default

[1st1]

BPO	32670
Nosy	@gvanrossum, @ncoghlan, @ned-deily, @1st1
PRs	bpo-32670: Enforce PEP 479. #5327

^{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 = 'https://github.com/1st1'
closed_at = <Date 2018-01-26.20:24:59.226>
created_at = <Date 2018-01-25.21:50:49.062>
labels = ['interpreter-core', 'type-feature', '3.7', 'release-blocker']
title = 'Enforce PEP 479\xe2\x80\x94StopIteration and generators\xe2\x80\x94in Python 3.7 by default'
updated_at = <Date 2018-01-26.20:24:59.225>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2018-01-26.20:24:59.225>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2018-01-26.20:24:59.226>
closer = 'yselivanov'
components = ['Interpreter Core']
creation = <Date 2018-01-25.21:50:49.062>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 32670
keywords = ['patch']
message_count = 2.0
messages = ['310712', '310789']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'ncoghlan', 'ned.deily', 'yselivanov']
pr_nums = ['5327']
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32670'
versions = ['Python 3.7']

[1st1]

As per PEP-479, in Python 3.7 it should be a RuntimeError when a StopIteration exception is raised manually in a generator, a coroutine, or an async generator.

[1st1]

New changeset 43c47fe by Yury Selivanov in branch 'master':
bpo-32670: Enforce PEP-479. (bpo-5327)
43c47fe