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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Assertion crash in `code_returns_only_none`","articleBody":"# Crash report\n\n### What happened?\n\nThere is incorrect assertion in `code_returns_only_none` function from `Objects/codeobject.c`:\n\n```python\n-\u003e % cat subinterpreteres_assert.py     \nfrom concurrent import interpreters\n\ninterp = interpreters.create()\ninterp.exec(\"\"\"while True: pass\"\"\")\n\n-\u003e % ./python subinterpreteres_assert.py\npython: Objects/codeobject.c:2132: code_returns_only_none: Assertion `IS_RAISE_OPCODE(final.op.code)' failed.\n[1]    1341262 IOT instruction  ./python subinterpreteres_assert.py\n```\n\nI've already have a PR which fixes it.\n\n### CPython versions tested on:\n\nCPython main branch, 3.14\n\n### Operating systems tested on:\n\n_No response_\n\n### Output from running 'python -VV' on the command line:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-139779\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/efimov-mikhail","@type":"Person","name":"efimov-mikhail"},"datePublished":"2025-10-08T13:58:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/139778/cpython/issues/139778"}