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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Defer functions defined in nested classes in free-threaded builds","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nWe currently only defer functions that do not have the `CO_NESTED` flag set:\n\nhttps://github.com/python/cpython/blob/26ff32b30553e1f7b0cc822835ad2da8890c180c/Objects/funcobject.c#L213-L218\n\nThis also excludes functions defined on nested classes. In the example below, the `Foo.__init__` function will not use deferred reference counting because the `__init__` method's code object has the `CO_NESTED` flag set.\n\n```py\ndef func():\n    class Foo:\n        def __init__(self):\n            pass\n```\n\nWe would like to relax the restriction on `CO_NESTED` to allow functions that are defined on nested classes to use deferred reference counting.\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-128012\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/mpage","@type":"Person","name":"mpage"},"datePublished":"2024-11-25T23:21:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/127274/cpython/issues/127274"}