Possible resource warning in "with open()"

BPO	34066
Nosy	@ncoghlan, @benjaminp, @jwilk, @markshannon, @serhiy-storchaka, @1st1, @miss-islington
PRs	bpo-34066: Disabled interruption before SETUP_WITH and BEFORE_ASYNC_WITH. #8159 [3.7] bpo-34066: Disabled interruption before SETUP_WITH and BEFORE_ASYNC_WITH. (GH-8159) #8197 [3.6] bpo-34066: Disabled interruption before SETUP_WITH and BEFORE_ASYNC_WITH. (GH-8159) #8198

^{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 2018-07-09.16:03:41.491>
created_at = <Date 2018-07-07.17:11:52.350>
labels = ['interpreter-core', '3.7', '3.8', 'performance']
title = 'Possible resource warning in "with open()"'
updated_at = <Date 2018-07-13.16:19:58.631>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2018-07-13.16:19:58.631>
actor = 'jwilk'
assignee = 'none'
closed = True
closed_date = <Date 2018-07-09.16:03:41.491>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2018-07-07.17:11:52.350>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 34066
keywords = ['patch']
message_count = 5.0
messages = ['321224', '321288', '321314', '321316', '321328']
nosy_count = 7.0
nosy_names = ['ncoghlan', 'benjamin.peterson', 'jwilk', 'Mark.Shannon', 'serhiy.storchaka', 'yselivanov', 'miss-islington']
pr_nums = ['8159', '8197', '8198']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue34066'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']