Fix several minor bugs in asyncio

[serhiy-storchaka]

BPO	33584
Nosy	@asvetlov, @serhiy-storchaka, @1st1
PRs	bpo-33584: Fix several minor bugs in asyncio. #7003 [3.7] bpo-33584: Fix several minor bugs in asyncio. (GH-7003) #7005 [3.6] bpo-33584: Fix several minor bugs in asyncio. (GH-7003) #7006

^{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 2018-05-20.14:52:23.866>
created_at = <Date 2018-05-20.09:15:21.974>
labels = ['extension-modules', '3.8', 'type-bug', '3.7', 'expert-asyncio']
title = 'Fix several minor bugs in asyncio'
updated_at = <Date 2018-05-20.14:52:23.865>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-05-20.14:52:23.865>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-20.14:52:23.866>
closer = 'serhiy.storchaka'
components = ['Extension Modules', 'asyncio']
creation = <Date 2018-05-20.09:15:21.974>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 33584
keywords = ['patch']
message_count = 4.0
messages = ['317160', '317167', '317171', '317172']
nosy_count = 3.0
nosy_names = ['asvetlov', 'serhiy.storchaka', 'yselivanov']
pr_nums = ['7003', '7005', '7006']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33584'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[serhiy-storchaka]

• get_future_loop() silenced all exceptions raised when look up the get_loop attribute, not just an AttributeError.

• enter_task() silenced all exceptions raised when look up the current task, not just a KeyError.

• repr() was called for a borrowed link in enter_task() and task_step_impl().

• str() was used instead of repr() in formatting one error message.

• There where few reference leaks.

[serhiy-storchaka]

New changeset 6655354 by Serhiy Storchaka in branch 'master':
bpo-33584: Fix several minor bugs in asyncio. (GH-7003)
6655354

[serhiy-storchaka]

New changeset 49418f6 by Serhiy Storchaka in branch '3.6':
[3.6] bpo-33584: Fix several minor bugs in asyncio. (GH-7003) (bpo-7006)
49418f6

[serhiy-storchaka]

New changeset 52d1741 by Serhiy Storchaka (Miss Islington (bot)) in branch '3.7':
bpo-33584: Fix several minor bugs in asyncio. (GH-7003) (GH-7005)
52d1741