Heap-allocated StructSequences

[eduardo-elizondo]

BPO	34784
Nosy	@encukou, @MojoVampire, @pablogsal, @eduardo-elizondo
PRs	bpo-34784: Fix PyStructSequence_NewType #9524 bpo-34784: Posixmodule: Heap StructSequence #9665 bpo-34784: Prevent creating types without bases on PyTuple_Pack failure #10536

^{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 2018-12-05.12:10:25.664>
created_at = <Date 2018-09-24.07:23:17.305>
labels = ['3.8', '3.7', 'library']
title = 'Heap-allocated StructSequences'
updated_at = <Date 2018-12-05.12:10:25.663>
user = 'https://github.com/eduardo-elizondo'

bugs.python.org fields:

activity = <Date 2018-12-05.12:10:25.663>
actor = 'petr.viktorin'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-05.12:10:25.664>
closer = 'petr.viktorin'
components = ['Library (Lib)']
creation = <Date 2018-09-24.07:23:17.305>
creator = 'eelizondo'
dependencies = []
files = []
hgrepos = []
issue_num = 34784
keywords = ['patch']
message_count = 5.0
messages = ['326205', '326946', '329834', '329882', '329939']
nosy_count = 4.0
nosy_names = ['petr.viktorin', 'josh.r', 'pablogsal', 'eelizondo']
pr_nums = ['9524', '9665', '10536']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34784'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[eduardo-elizondo]

PyStructSequence_NewType does not currently work. Read the full analysis here: https://mail.python.org/pipermail/python-dev/2018-September/155069.html

This aims to fix the implementation of PyStructSequence_NewType.

[MojoVampire]

This looks like a duplicate of bpo-28709, though admittedly, that bug hasn't seen any PRs.

[encukou]

New changeset 474eedf by Petr Viktorin (Eddie Elizondo) in branch 'master':
bpo-34784: Fix PyStructSequence_NewType with heap-allocated StructSequence (GH-9665)
474eedf

[pablogsal]

PR9665 solves also bpo-28709

[pablogsal]

New changeset bfb855b by Pablo Galindo in branch 'master':
bpo-34784: Implement correct cleanup in PyStructSequence new implementation (GH-10536)
bfb855b