René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PEP 709 behavior change around mangling","articleBody":"Another bug with comprehension inlining.\r\n\r\nI made the fuzzer (https://github.com/carljm/compgenerator/pull/1) use `__a` and `__b` as names in the hope of finding bugs around name mangling and got this one:\r\n\r\n```python\r\nclass __a:\r\n    __a = (1)[[__a for __b in [1]]] = 1\r\n```\r\n\r\nOn #104602:\r\n\r\n```pycon\r\n\u003e\u003e\u003e class __a:\r\n...     __a = (1)[[__a for __b in [1]]] = 1\r\n... \r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"\u003cstdin\u003e\", line 2, in __a\r\nTypeError: 'int' object does not support item assignment\r\n```\r\n\r\nOn 3.11:\r\n```pycon\r\n\u003e\u003e\u003e class __a:\r\n...     __a = (1)[[__a for __b in [1]]] = 1\r\n... \r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"\u003cstdin\u003e\", line 2, in __a\r\n  File \"\u003cstdin\u003e\", line 2, in \u003clistcomp\u003e\r\nNameError: name '_a__a' is not defined. Did you mean: '_a__b'?\r\n```\r\n\r\nI think that means we're missing some name mangling, but haven't thought too deeply about this yet.","author":{"url":"https://github.com/JelleZijlstra","@type":"Person","name":"JelleZijlstra"},"datePublished":"2023-05-18T05:40:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/104604/cpython/issues/104604"}