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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Source locations of comprehension bytecode are incorrect","articleBody":"```\r\ndef f():\r\n  [(x,\r\n   2*x) \r\n   for x\r\n   in [1,2,3] if (x \u003e 0 \r\n                  and x \u003c 100\r\n                  and x != 50)]\r\n\r\nf = f.__code__.co_consts[1]\r\n\r\n\r\nimport dis\r\nfrom pprint import pprint as pp\r\ndef pos(p):\r\n    return (p.lineno, p.end_lineno, p.col_offset, p.end_col_offset)\r\n \r\npp([(pos(x.positions), x.opname, x.argval) for x in dis.get_instructions(f)])\r\n```\r\n\r\nThe output is:\r\n\r\n```\r\n[((3, 3, 0, 0), 'RESUME', 0),\r\n ((3, 8, 2, 31), 'BUILD_LIST', 0),\r\n ((3, 8, 2, 31), 'LOAD_FAST', '.0'),\r\n ((3, 8, 2, 31), 'FOR_ITER', 66),\r\n ((5, 5, 7, 8), 'STORE_FAST', 'x'),\r\n ((6, 6, 18, 19), 'LOAD_FAST', 'x'),\r\n ((6, 6, 22, 23), 'LOAD_CONST', 0),\r\n ((6, 6, 18, 23), 'COMPARE_OP', '\u003e'),\r\n ((6, 6, 18, 23), 'POP_JUMP_IF_FALSE', 64),\r\n ((7, 7, 22, 23), 'LOAD_FAST', 'x'),\r\n ((7, 7, 26, 29), 'LOAD_CONST', 100),\r\n ((7, 7, 22, 29), 'COMPARE_OP', '\u003c'),\r\n ((7, 7, 22, 29), 'POP_JUMP_IF_FALSE', 64),\r\n ((8, 8, 22, 23), 'LOAD_FAST', 'x'),\r\n ((8, 8, 27, 29), 'LOAD_CONST', 50),\r\n ((8, 8, 22, 29), 'COMPARE_OP', '!='),\r\n ((8, 8, 22, 29), 'POP_JUMP_IF_TRUE', 50),\r\n ((None, None, None, None), 'JUMP_BACKWARD', 6),\r\n ((3, 3, 4, 5), 'LOAD_FAST', 'x'),\r\n ((4, 4, 3, 4), 'LOAD_CONST', 2),\r\n ((4, 4, 5, 6), 'LOAD_FAST', 'x'),\r\n ((4, 4, 3, 6), 'BINARY_OP', 5),\r\n ((3, 4, 3, 7), 'BUILD_TUPLE', 2),\r\n ((8, 8, 22, 29), 'LIST_APPEND', 2),                     \u003c-- incorrect from here to the end\r\n ((8, 8, 22, 29), 'JUMP_BACKWARD', 6),\r\n ((8, 8, 22, 29), 'RETURN_VALUE', None)]\r\n```","author":{"url":"https://github.com/iritkatriel","@type":"Person","name":"iritkatriel"},"datePublished":"2022-10-19T18:47:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/98461/cpython/issues/98461"}