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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Infinite recursion in the tokenizer when emitting invalid escape sequence warnings","articleBody":"### Checklist\n\n- [X] I am confident this is a bug in CPython, not a bug in a third-party project\n- [X] I have searched the [CPython issue tracker](https://github.com/python/cpython/issues?q=is%3Aissue+sort%3Acreated-desc),\nand am confident this bug has not been reported before\n\n\n### CPython versions tested on:\n\n3.12, CPython main branch\n\n### Operating systems tested on:\n\nmacOS\n\n### Output from running 'python -VV' on the command line:\n\nPython 3.11.3 (main, May  8 2023, 13:16:43) [Clang 14.0.3 (clang-1403.0.22.14.1)]\n\n### A clear and concise description of the bug:\n\nThe tokenizer has an infinite recursion when emitting an invalid escape sequence `SyntaxWarning`. This was probably introduced in #106993. Fix will be up shortly.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-107968\n* gh-107970\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/lysnikolaou","@type":"Person","name":"lysnikolaou"},"datePublished":"2023-08-15T09:55:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/107967/cpython/issues/107967"}