René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Duplicate frame in traceback of exception raised inside trace function","articleBody":"First appeared in e028ae99ecee671c0e8a3eabb829b5b2acfc4441.\r\nReproducer:\r\n```python\r\nimport sys\r\n\r\ndef f():\r\n    pass\r\n\r\ndef trace(frame, event, arg):\r\n    raise ValueError()\r\n\r\nsys.settrace(trace)\r\nf()\r\n```\r\n\r\nBefore 'bad' commit (3e43fac2503afe219336742b150b3ef6e470686f):\r\n```\r\nTraceback (most recent call last):\r\n  File \"/home/.../trace_tb_bug.py\", line 10, in \u003cmodule\u003e\r\n    f()\r\n    ^^^\r\n  File \"/home/.../trace_tb_bug.py\", line 3, in f\r\n    def f():\r\n  File \"/home/.../trace_tb_bug.py\", line 7, in trace\r\n    raise ValueError()\r\n    ^^^^^^^^^^^^^^^^^^\r\nValueError\r\n```\r\n\r\nAfter 'bad' commit (e028ae99ecee671c0e8a3eabb829b5b2acfc4441):\r\n```\r\nTraceback (most recent call last):\r\n  File \"/home/.../trace_tb_bug.py\", line 10, in \u003cmodule\u003e\r\n    f()\r\n    ^^^\r\n  File \"/home/.../trace_tb_bug.py\", line 3, in f\r\n    def f():\r\n    \r\n  File \"/home/.../trace_tb_bug.py\", line 3, in f\r\n    def f():\r\n    \r\n  File \"/home/.../trace_tb_bug.py\", line 7, in trace\r\n    raise ValueError()\r\n    ^^^^^^^^^^^^^^^^^^\r\nValueError\r\n```\r\n\r\n3.11.0 release and main (039714d00f) also lack pointers to error locations, but this probably needs a different issue:\r\n```\r\nTraceback (most recent call last):\r\n  File \"/home/.../trace_tb_bug.py\", line 10, in \u003cmodule\u003e\r\n    f()\r\n  File \"/home/.../trace_tb_bug.py\", line 3, in f\r\n    def f():\r\n    \r\n  File \"/home/.../trace_tb_bug.py\", line 3, in f\r\n    def f():\r\n    \r\n  File \"/home/.../trace_tb_bug.py\", line 7, in trace\r\n    raise ValueError()\r\nValueError\r\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104579\n* gh-104650\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/chgnrdv","@type":"Person","name":"chgnrdv"},"datePublished":"2023-03-18T18:28:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/102818/cpython/issues/102818"}