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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Pegen improperly memoizes loop rules","articleBody":"# Bug report\r\n\r\nIn the following part of pegen, the memoized result is only used if `self._should_memoize(node)` is true. Since loop rules are autogenerated, they are not marked with `(memo)`, so this is always false. Despite that, in the end the result is memoized based on the different condition `if node.name`. Because of that, in the generated parser loop rules' results are always stored in the cache, but never accessed later.\r\n\r\nhttps://github.com/python/cpython/blob/8de59c1bb9fdcea69ff6e6357972ef1b75b71721/Tools/peg_generator/pegen/c_generator.py#L608-L647\r\n\r\n# Your environment\r\n\r\nDoes not matter - discovered through manual code analysis\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102467\n* gh-102473\n* gh-102474\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/abel1502","@type":"Person","name":"abel1502"},"datePublished":"2023-03-04T09:40:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/102416/cpython/issues/102416"}