Implement Py_TPFLAGS_METHOD_DESCRIPTOR

[jdemeyer]

BPO	36922
Nosy	@encukou, @methane, @markshannon, @jdemeyer, @miss-islington
PRs	bpo-36922: implement Py_TPFLAGS_METHOD_DESCRIPTOR #13338 bpo-36922: use Py_TPFLAGS_METHOD_DESCRIPTOR in lookup_maybe_method() #13865 [3.8] bpo-36922: use Py_TPFLAGS_METHOD_DESCRIPTOR in lookup_maybe_method() (GH-13865) #14155

^{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 2019-05-28.12:44:39.400>
created_at = <Date 2019-05-15.08:39:45.066>
labels = ['interpreter-core', 'type-feature', '3.8']
title = 'Implement Py_TPFLAGS_METHOD_DESCRIPTOR'
updated_at = <Date 2019-06-17.12:12:55.305>
user = 'https://github.com/jdemeyer'

bugs.python.org fields:

activity = <Date 2019-06-17.12:12:55.305>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-28.12:44:39.400>
closer = 'petr.viktorin'
components = ['Interpreter Core']
creation = <Date 2019-05-15.08:39:45.066>
creator = 'jdemeyer'
dependencies = []
files = []
hgrepos = []
issue_num = 36922
keywords = ['patch']
message_count = 4.0
messages = ['342554', '343770', '345848', '345849']
nosy_count = 5.0
nosy_names = ['petr.viktorin', 'methane', 'Mark.Shannon', 'jdemeyer', 'miss-islington']
pr_nums = ['13338', '13865', '14155']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36922'
versions = ['Python 3.8']

[jdemeyer]

The new flag Py_TPFLAGS_METHOD_DESCRIPTOR proposed in PEP-590 is meant for classes whose instances behave like unbound methods. In other words, it's meant for objects supporting the LOAD_METHOD optimization. There are two such classes in CPython: function and method_descriptor. But the goal is to enable more such classes.

This is independent from the rest of PEP-590 so let's implement it separately.

[encukou]

New changeset eb65e24 by Petr Viktorin (Jeroen Demeyer) in branch 'master':
bpo-36922: implement PEP-590 Py_TPFLAGS_METHOD_DESCRIPTOR (GH-13338)
eb65e24

[methane]

New changeset 2e9954d by Inada Naoki (Jeroen Demeyer) in branch 'master':
bpo-36922: use Py_TPFLAGS_METHOD_DESCRIPTOR in lookup_maybe_method() (GH-13865)
2e9954d

[miss-islington]

New changeset 988fff5 by Miss Islington (bot) in branch '3.8':
bpo-36922: use Py_TPFLAGS_METHOD_DESCRIPTOR in lookup_maybe_method() (GH-13865)
988fff5