Remove support for obsolete flags in compile function

[isidentical]

BPO	40366
Nosy	@isidentical
PRs	bpo-40366: Remove support for passing obsolete flags into compile #19660

^{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 = None
created_at = <Date 2020-04-22.19:44:23.008>
labels = ['3.9']
title = 'Remove support for obsolete flags in compile function'
updated_at = <Date 2020-04-22.23:32:17.758>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-04-22.23:32:17.758>
actor = 'BTaskaya'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-04-22.19:44:23.008>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 40366
keywords = ['patch']
message_count = 2.0
messages = ['367046', '367062']
nosy_count = 1.0
nosy_names = ['BTaskaya']
pr_nums = ['19660']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40366'
versions = ['Python 3.9']

[isidentical]

We can start deprecating usage of obsoleted flags in compile and slowly remove support for them. An example would be CO_NESTED.

https://github.com/python/cpython/blob/master/Python/bltinmodule.c#L748

[isidentical]

As suggestion of @vstinner, instead of deprecation we decided to remove support for these flags immediately.

[vstinner]

I close the issue: #19660 (comment)