René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Annotated assignment in a `match` block does not generate `SETUP_ANNOTATIONS`","articleBody":"# Bug report\r\n\r\nCompiling the following code:\r\n\r\n```\r\nmatch 0:\r\n    case 0:\r\n        x: int = 1\r\n```\r\n\r\ngenerates\r\n\r\n```\r\n  1           0 LOAD_CONST               0 (0)\r\n\r\n  2           2 LOAD_CONST               0 (0)\r\n              4 COMPARE_OP               2 (==)\r\n              6 POP_JUMP_IF_FALSE       12 (to 24)\r\n\r\n  3           8 LOAD_CONST               1 (1)\r\n             10 STORE_NAME               0 (x)\r\n             12 LOAD_NAME                1 (int)\r\n             14 LOAD_NAME                2 (__annotations__)\r\n             16 LOAD_CONST               2 ('x')\r\n             18 STORE_SUBSCR\r\n             20 LOAD_CONST               3 (None)\r\n             22 RETURN_VALUE\r\n\r\n  2     \u003e\u003e   24 LOAD_CONST               3 (None)\r\n             26 RETURN_VALUE\r\n```\r\n\r\nThere is no `SETUP_ANNOTATIONS` opcode generated despite the `__annotations__` access later on. (Found via https://github.com/google/pytype/issues/1435 - for some reason this does not generate a runtime error, but it does cause issues for tools like pytype.)\r\n\r\n# Your environment\r\n\r\ncpython 3.10\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-105177\n* gh-105313\n* gh-105314\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/martindemello","@type":"Person","name":"martindemello"},"datePublished":"2023-05-31T18:31:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/105164/cpython/issues/105164"}