Comprehensions and await need more unittests

[njsmith]

BPO	27168
Nosy	@njsmith, @1st1

^{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 2016-10-05.23:46:50.967>
created_at = <Date 2016-05-31.18:06:54.667>
labels = ['interpreter-core', 'type-bug', 'tests']
title = 'Comprehensions and await need more unittests'
updated_at = <Date 2016-10-05.23:46:50.966>
user = 'https://github.com/njsmith'

bugs.python.org fields:

activity = <Date 2016-10-05.23:46:50.966>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-10-05.23:46:50.967>
closer = 'yselivanov'
components = ['Interpreter Core', 'Tests']
creation = <Date 2016-05-31.18:06:54.667>
creator = 'njs'
dependencies = []
files = []
hgrepos = []
issue_num = 27168
keywords = []
message_count = 2.0
messages = ['266763', '278163']
nosy_count = 2.0
nosy_names = ['njs', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27168'
versions = ['Python 3.5', 'Python 3.6']

[njsmith]

So he asked me to file a bug reminding him to write more unit tests.

Interesting cases:

async def f():
    return (x for x in await g())

async def f():
    return (await x for x in g())

(and ditto for [], {} comprehensions)

[1st1]

Closing this one. We added a lot of tests as part of the PEP-530 implementation.