SyntaxError for yield expressions inside comprehensions & genexps

[ncoghlan]

BPO	32189
Nosy	@ncoghlan, @serhiy-storchaka
PRs	[3.8] bpo-10544: Disallow "yield" in comprehensions and generator expressions. #4564

^{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 2018-05-09.09:20:46.649>
created_at = <Date 2017-12-01.04:57:38.775>
labels = ['interpreter-core', 'type-bug', '3.8']
title = 'SyntaxError for yield expressions inside comprehensions & genexps'
updated_at = <Date 2018-05-09.09:20:46.648>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2018-05-09.09:20:46.648>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-09.09:20:46.649>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2017-12-01.04:57:38.775>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 32189
keywords = ['patch']
message_count = 1.0
messages = ['307360']
nosy_count = 2.0
nosy_names = ['ncoghlan', 'serhiy.storchaka']
pr_nums = ['4564']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32189'
versions = ['Python 3.8']

[ncoghlan]

This is the Python 3.8 follow-up to turn the DeprecationWarning from https://bugs.python.org/issue10544 into an unconditional SyntaxError.