Use specs instead of just __loader__ in C code

[brettcannon]

BPO	42132
Nosy	@brettcannon, @corona10

^{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 2020-10-23.22:16:01.448>
labels = ['interpreter-core', 'type-bug', '3.10']
title = 'Use specs instead of just __loader__ in C code'
updated_at = <Date 2020-10-24.16:28:23.690>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2020-10-24.16:28:23.690>
actor = 'corona10'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2020-10-23.22:16:01.448>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 42132
keywords = []
message_count = 1.0
messages = ['379483']
nosy_count = 2.0
nosy_names = ['brett.cannon', 'corona10']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42132'
versions = ['Python 3.10']

Linked PRs

• gh-122255: Add black box tests in test_warnings #122227

[brettcannon]

_warnings.c, pylifecycle.c, and pythonrun.c all either use or set __loader__ but without also falling back on __spec__.

[warsaw]

I'm going to take a look at these module attribute issues during the 2022 core sprint.

[warsaw]

I have _warnings.c implemented and tested.