Make old-style classes weak referenceable

[pitrou]

BPO	8268
Nosy	@amauryfa, @pitrou
Files	weakref-classobj.patch

^{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 2010-03-31.21:38:49.209>
created_at = <Date 2010-03-30.22:58:12.632>
labels = ['interpreter-core', 'type-feature']
title = 'Make old-style classes weak referenceable'
updated_at = <Date 2010-03-31.21:38:49.206>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2010-03-31.21:38:49.206>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2010-03-31.21:38:49.209>
closer = 'pitrou'
components = ['Interpreter Core']
creation = <Date 2010-03-30.22:58:12.632>
creator = 'pitrou'
dependencies = []
files = ['16702']
hgrepos = []
issue_num = 8268
keywords = ['patch']
message_count = 3.0
messages = ['101957', '101958', '102035']
nosy_count = 3.0
nosy_names = ['amaury.forgeotdarc', 'pitrou', 'stutzbach']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue8268'
versions = ['Python 2.7']

[pitrou]

New-style classes are weak referenceable, but old-style classes are not.
For a proper implementation of ABC caches without any memory leaks (see bpo-2521), this limitation should be raised.

[pitrou]

Here is a patch.

[pitrou]

Fixed in r79535.