C implementation of asyncio.Future doesn't set value of StopIteration correctly

[1st1]

BPO	28492
Nosy	@gvanrossum, @methane, @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 = None
closed_at = <Date 2016-10-20.19:56:37.102>
created_at = <Date 2016-10-20.19:42:44.066>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = "C implementation of asyncio.Future doesn't set value of StopIteration correctly"
updated_at = <Date 2016-10-21.14:59:49.227>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-10-21.14:59:49.227>
actor = 'yselivanov'
assignee = 'none'
closed = True
closed_date = <Date 2016-10-20.19:56:37.102>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2016-10-20.19:42:44.066>
creator = 'yselivanov'
dependencies = []
files = []
hgrepos = []
issue_num = 28492
keywords = []
message_count = 4.0
messages = ['279070', '279073', '279074', '279103']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'methane', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28492'
versions = ['Python 3.6', 'Python 3.7']

[1st1]

Specifically when the result of the Future is tuple.

[python-dev]

New changeset cfe2109ce2c0 by Yury Selivanov in branch '3.6':
Issue bpo-28492: Fix how StopIteration is raised in _asyncio.Future
https://hg.python.org/cpython/rev/cfe2109ce2c0

New changeset 79b9257f3386 by Yury Selivanov in branch 'default':
Merge 3.6 (issue bpo-28492)
https://hg.python.org/cpython/rev/79b9257f3386

[1st1]

Inada-san, please take a look at my commit if you have time.

[methane]

Confirmed, thank you.