Drop support for asynchronous __aiter__

[1st1]

BPO	31709
Nosy	@ncoghlan, @1st1
PRs	#3903 #3906

^{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 2017-10-06.06:09:14.195>
created_at = <Date 2017-10-06.04:23:47.086>
labels = ['interpreter-core', '3.7']
title = 'Drop support for asynchronous __aiter__'
updated_at = <Date 2017-10-06.06:22:59.015>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-10-06.06:22:59.015>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2017-10-06.06:09:14.195>
closer = 'yselivanov'
components = ['Interpreter Core']
creation = <Date 2017-10-06.04:23:47.086>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 31709
keywords = ['patch']
message_count = 2.0
messages = ['303796', '303802']
nosy_count = 2.0
nosy_names = ['ncoghlan', 'yselivanov']
pr_nums = ['3903', '3906']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue31709'
versions = ['Python 3.7']

[1st1]

As discussed in bpo-27243, we want to drop support of asynchronous __aiter__ in Python 3.7.

Together with bpo-30406, this will enable us to add support for using asynchronous generator expressions in synchronous functions (bpo-31708)

[1st1]

New changeset faa135a by Yury Selivanov in branch 'master':
bpo-31709: Drop support for asynchronous __aiter__. (bpo-3903)
faa135a