René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Jumping before comprehensions yields SIGSEGV","articleBody":"Full reproducer:\r\n```\r\nimport sys\r\n\r\n\r\ndef fun():\r\n    a = 1  # \u003c---- jump location\r\n\r\n    x = [i for i in range(10)]\r\n\r\n    c = 3  # current location\r\n\r\n\r\ndef trace(frame, event, arg):\r\n    if event == \"line\" and frame.f_lineno == 9:\r\n        frame.f_lineno = 4\r\n\r\n    return trace\r\n\r\n\r\nsys.settrace(trace)\r\n\r\nif __name__ == \"__main__\":\r\n    fun()\r\n```\r\nJumping from line `current location` to `jump location` yields SIGSEGV\r\n\r\n**Error messages**\r\n\r\n```\r\n.venv/bin/python \u003ccwd\u003e/cakeshop.py\r\nFatal Python error: Segmentation fault\r\n\r\nCurrent thread 0x00007f16eaae5280 (most recent call first):\r\n  File \"\u003ccwd\u003e/cakeshop.py\", line 14 in trace\r\n  File \"\u003ccwd\u003e/cakeshop.py\", line 9 in fun\r\n  File \"\u003ccwd\u003e/cakeshop.py\", line 22 in \u003cmodule\u003e\r\n\r\nProcess finished with exit code 139 (interrupted by signal 11: SIGSEGV)\r\n\r\n```\r\n**Your environment**\r\n\r\n- CPython versions tested on: 3.9.11, 3.10.1 (3.11.x works as expected same as \u003c3.9)\r\n- Operating system and architecture: Linux q 5.4.0-42-generic x64\r\n","author":{"url":"https://github.com/dkrystki","@type":"Person","name":"dkrystki"},"datePublished":"2022-05-04T16:16:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/92311/cpython/issues/92311"}