René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"typing tests: Not all subclass cases are covered","articleBody":"There are a lot of test cases in `test_typing.py` where we test that different typing things cannot be used as base classes. However, there are multiple missing cases. Examples:\r\n- `Final` / `Final[int]` is not tested to be invalid base class: https://github.com/python/cpython/blob/53a54b781d1f05f2d0b40ce88b3da92d5d23e9d2/Lib/test/test_typing.py#L3748-L3756\r\n- `Ts` is tested, but `*Ts` is not: https://github.com/python/cpython/blob/53a54b781d1f05f2d0b40ce88b3da92d5d23e9d2/Lib/test/test_typing.py#L1039\r\n- Different special forms only tested with / or without `[]`\r\n- And other issues\r\n\r\nI think this should be all covered. I went through all subtyping tests and added more cases.\r\nI will send a PR :)","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2022-09-12T10:43:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/96769/cpython/issues/96769"}