René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`code_richcompare` swallows errors","articleBody":"# Bug report\n\n### Bug description:\n\n\nThis is a sub-issue for #146102 and more details can be found [here](https://gist.github.com/devdanzin/d602d174ce2b8959759c94729a35c54e).\n\n---\nIn `code_richcompare` on line 2608, `PyObject_RichCompareBool` can return an error (-1), but that is treated incorrectly since `!(-1) == 0 `. Reproducer:\n```python\n\nclass BadStr(str):\n    _armed = False\n    def __eq__(self, other):\n        if BadStr._armed and isinstance(other, str) and str.__eq__(self, other):\n            raise RuntimeError(\"Poison!\")\n        return str.__eq__(self, other)\n    def __hash__(self): return str.__hash__(self)\n\nc1 = compile(\"pass\", \"test\", \"exec\")\nc2 = c1.replace(co_name=BadStr(\"poison\"))\nc3 = compile(\"pass\", \"poison\", \"exec\")\nBadStr._armed = True\nc2 == c3  # assertion: !_PyErr_Occurred(tstate)\n```\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-146200\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/brijkapadia","@type":"Person","name":"brijkapadia"},"datePublished":"2026-03-20T10:31:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/146199/cpython/issues/146199"}