Remove asyncio.async function

[1st1]

BPO	32272
Nosy	@asvetlov, @1st1
PRs	bpo-32272: Remove asyncio.async() function. #4784

^{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 2017-12-11.15:04:05.659>
created_at = <Date 2017-12-10.23:57:08.282>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = 'Remove asyncio.async function'
updated_at = <Date 2017-12-11.15:04:05.658>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-12-11.15:04:05.658>
actor = 'yselivanov'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-11.15:04:05.659>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2017-12-10.23:57:08.282>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 32272
keywords = ['patch']
message_count = 3.0
messages = ['308006', '308007', '308048']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['4784']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32272'
versions = ['Python 3.7']

[1st1]

asyncio.async() is a deprecated alias for asyncio.ensure_future().

Since Python 3.7, async and await are proper keywords, and it is no longer possible to use the function. I.e. both 'from asyncio import async' and 'asyncio.async(...)' are a SyntaxError.

[1st1]

The function has been deprecated since Python 3.4.4.

[1st1]

New changeset 9edad3c by Yury Selivanov in branch 'master':
bpo-32272: Remove asyncio.async() function. (bpo-4784)
9edad3c