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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PEP 709: Crash with lambda + nested scope","articleBody":"This crashes on main:\r\n\r\n```python\r\ndef a():\r\n    def a():\r\n        [(lambda : b) for b in [a]]\r\n        print(b)\r\n```\r\n\r\nThe original reproducer (found with my fork of https://github.com/carljm/compgenerator) was\r\n\r\n```python\r\nclass a:\r\n    def a():\r\n        class a:\r\n            [(lambda : (a := a[(a := 2)])[b]) for b in (lambda b, a: 7)[a]]\r\n            [][2] = b\r\n            (1)[lambda a: a] = 4\r\n            (2)[2] = b = a\r\n        (4)[lambda b, a: b] = a = lambda : 1\r\n```\r\n\r\nFound in https://github.com/python/cpython/pull/104528#issuecomment-1551772622 but turned out be unrelated to that PR.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-104603\n* gh-104639\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/JelleZijlstra","@type":"Person","name":"JelleZijlstra"},"datePublished":"2023-05-18T04:14:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/104602/cpython/issues/104602"}