asyncio.Task implemented in C loses __traceback__ for exceptions

[1st1]

BPO	28843
Nosy	@gvanrossum, @ned-deily, @methane, @1st1
Files	task_tb.patch

^{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 2016-12-01.16:38:39.349>
created_at = <Date 2016-11-30.18:44:53.640>
labels = ['type-bug', '3.7', 'expert-asyncio']
title = 'asyncio.Task implemented in C loses __traceback__ for exceptions'
updated_at = <Date 2016-12-01.16:38:39.347>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2016-12-01.16:38:39.347>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2016-12-01.16:38:39.349>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2016-11-30.18:44:53.640>
creator = 'yselivanov'
dependencies = []
files = ['45711']
hgrepos = []
issue_num = 28843
keywords = ['patch']
message_count = 3.0
messages = ['282092', '282198', '282199']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'ned.deily', 'methane', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28843'
versions = ['Python 3.6', 'Python 3.7']

[1st1]

When a coroutine wrapped in a C asyncio.Task raises an Exception, the Task fails to correctly save the __traceback__.

[python-dev]

New changeset c9f68150cf90 by Yury Selivanov in branch '3.6':
Issue bpo-28843: Fix asyncio C Task to handle exceptions __traceback__.
https://hg.python.org/cpython/rev/c9f68150cf90

New changeset a21a8943c59e by Yury Selivanov in branch 'default':
Merge 3.6 (issue bpo-28843)
https://hg.python.org/cpython/rev/a21a8943c59e

[1st1]

Thanks for reviewing the patch, Inada-san. Closing the issue.