René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Invalid error messages after GH-134077","articleBody":"# Bug report\n\nIn https://github.com/python/cpython/issues/134036 (PR: #134077) I broke this use-case:\n\n```python\n# ex.py\nraise AssertionError() from None\n\nprint(1,,2)\n```\n\nRunning `./python.exe ex.py` on it produces:\n\n```\n» ./python.exe ex.py\n  File \"/Users/sobolev/Desktop/cpython/ex.py\", line 1\n    raise AssertionError() from None\n                           ^^^^\nSyntaxError: did you forget an expression after 'from'?\n```\n\nWhich is not correct. I am fixing it right now, sorry! :(\n\nCC @pablogsal @lysnikolaou \n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135423\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2025-06-12T07:59:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/135422/cpython/issues/135422"}