Allow use of asynchronous generator expressions in synchronous functions

[1st1]

BPO	31708
Nosy	@ncoghlan, @1st1
PRs	bpo-31708: Allow async generator expressions in synchronous functions #3905
Dependencies	bpo-31709: Drop support for asynchronous aiter

^{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 2017-10-06.06:58:58.103>
created_at = <Date 2017-10-06.04:23:32.003>
labels = ['interpreter-core', 'type-bug', '3.7']
title = 'Allow use of asynchronous generator expressions in synchronous functions'
updated_at = <Date 2017-10-06.06:58:58.102>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-10-06.06:58:58.102>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2017-10-06.06:58:58.103>
closer = 'yselivanov'
components = ['Interpreter Core']
creation = <Date 2017-10-06.04:23:32.003>
creator = 'yselivanov'
dependencies = ['31709']
files = []
hgrepos = []
issue_num = 31708
keywords = ['patch']
message_count = 3.0
messages = ['303797', '303803', '303805']
nosy_count = 2.0
nosy_names = ['ncoghlan', 'yselivanov']
pr_nums = ['3905']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31708'
versions = ['Python 3.7']

[1st1]

Prior to Python 3.7 we couldn't enable use of asynchronous generator expressions in synchronous functions:

    async arange(n):
        for i in range(n):
            yield i

    def make_arange(n):
        return (i async for i in arange(n))

[1st1]

(this is per PEP-530: https://www.python.org/dev/peps/pep-0530/#asynchronous-comprehensions)

[1st1]

New changeset b8ab9d3 by Yury Selivanov in branch 'master':
bpo-31708: Allow async generator expressions in synchronous functions (bpo-3905)
b8ab9d3