René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Bug or new behavior of generics parameterization?","articleBody":"```python3\r\nfrom typing import TypeVar, Generic, Callable\r\n\r\n\r\nT = TypeVar(\"T\")\r\nP = TypeVar(\"P\")\r\n\r\nclass Test(Generic[T]): ...\r\n\r\n\r\nS = Callable[[Test], P]\r\n\r\ndef test(arg: S[T]): ...\r\n\r\n```\r\n\r\nOn python3.11 i can't run this code. Code falls on an attempt to parameterize `S`\r\nTraceback:\r\n\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"C:\\Users\\KIRILL-1\\PycharmProjects\\dataclass_factory\\exp.py\", line 12, in \u003cmodule\u003e                  \r\n    def test(arg: S[T]): ...                                                                               \r\n                  ~^^^                                                                                     \r\n  File \"C:\\Users\\KIRILL-1\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\typing.py\", line 360, in inner       \r\n    return cached(*args, **kwds)\r\n           ^^^^^^^^^^^^^^^^^^^^^\r\n  File \"C:\\Users\\KIRILL-1\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\typing.py\", line 1391, in __getitem__\r\n    new_args = self._determine_new_args(args)\r\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"C:\\Users\\KIRILL-1\\AppData\\Local\\Programs\\Python\\Python311\\Lib\\typing.py\", line 1440, in _determine_new_args\r\n    subargs.append(new_arg_by_param[x])\r\n                   ~~~~~~~~~~~~~~~~^^^\r\nKeyError: ~T\r\n```\r\nHow i understand, in 3.11, an attempt is being made to parameterize `Test` in `S`, but in 3.10 - not\r\nIs it new behavior or a bug?\r\n\n\n\u003c!-- gh-pr-number: gh-98920 --\u003e\n* PR: gh-98920\n\u003c!-- /gh-pr-number --\u003e\n\n\n\u003c!-- gh-pr-number: gh-98952 --\u003e\n* PR: gh-98952\n\u003c!-- /gh-pr-number --\u003e\n\n\n\u003c!-- gh-pr-number: gh-98969 --\u003e\n* PR: gh-98969\n\u003c!-- /gh-pr-number --\u003e\n","author":{"url":"https://github.com/Eclips4","@type":"Person","name":"Eclips4"},"datePublished":"2022-10-29T16:39:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/98852/cpython/issues/98852"}