{"abstract":"A final terminator becomes an extra numbered line.","category":"Text processing","checks":4,"contract":"Number physical LF lines from one; final LF adds no record, but interior empty lines remain.","evaluation_group":"model-e6b2fd77c67e89d3","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-line-number-empty-tail","id":"FA-3801","implementations":{"attempt":{"sha256":"cdd7f6bba4d974c8ea2142d9b6ab0a2e44a5c46f3234dadb4f6fc8ce5c716192","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [[i+1,v] for i,v in enumerate(x.split('\\n')) if v]\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('a\\n'), [[1, 'a']])\ncheck('boundary 2', solve('a\\n\\nb'), [[1, 'a'], [2, ''], [3, 'b']])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('\\n'), [[1, '']])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"ca5391dc070fa55472f64c4ac51f0a3fa64b5cbbccd4b41203fc74b890a9d4b7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [[i+1,v] for i,v in enumerate(x.split('\\n'))]\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('a\\n'), [[1, 'a']])\ncheck('boundary 2', solve('a\\n\\nb'), [[1, 'a'], [2, ''], [3, 'b']])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('\\n'), [[1, '']])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"65b64e96f5c6fabd083abce864cb777db19eefb92bfb08bbc752dedf40de7d58","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [[i+1,v] for i,v in enumerate(x[:-1].split('\\n') if x.endswith('\\n') else x.split('\\n'))] if x else []\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('a\\n'), [[1, 'a']])\ncheck('boundary 2', solve('a\\n\\nb'), [[1, 'a'], [2, ''], [3, 'b']])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('\\n'), [[1, '']])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xp-line-number-empty-tail","generated_at":"2026-09-29T14:37:31.159010+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","repair":"Implement the complete stated contract, including the boundary fixtures: Number physical LF lines from one; final LF adds no record, but interior empty lines remain.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Number physical LF lines from one; final LF adds no record, but interior empty lines remain.","sha256":"2f66b244d03d84880c40a47efd5c9545e4fd1f8c96c789e0ca84c27cadba286e","title":"A final terminator becomes an extra numbered line · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":57.616,"exit_code":1,"observations":[{"actual":[[1,"a"]],"check":"boundary 1","expected":[[1,"a"]],"passed":true},{"actual":[[1,"a"],[3,"b"]],"check":"boundary 2","expected":[[1,"a"],[2,""],[3,"b"]],"passed":false},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":[],"check":"boundary 4","expected":[[1,""]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [[1, \"a\"]], \"expected\": [[1, \"a\"]], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [[1, \"a\"], [3, \"b\"]], \"expected\": [[1, \"a\"], [2, \"\"], [3, \"b\"]], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [[1, \"\"]], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":58.094,"exit_code":1,"observations":[{"actual":[[1,"a"],[2,""]],"check":"boundary 1","expected":[[1,"a"]],"passed":false},{"actual":[[1,"a"],[2,""],[3,"b"]],"check":"boundary 2","expected":[[1,"a"],[2,""],[3,"b"]],"passed":true},{"actual":[[1,""]],"check":"boundary 3","expected":[],"passed":false},{"actual":[[1,""],[2,""]],"check":"boundary 4","expected":[[1,""]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [[1, \"a\"], [2, \"\"]], \"expected\": [[1, \"a\"]], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [[1, \"a\"], [2, \"\"], [3, \"b\"]], \"expected\": [[1, \"a\"], [2, \"\"], [3, \"b\"]], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [[1, \"\"]], \"expected\": [], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [[1, \"\"], [2, \"\"]], \"expected\": [[1, \"\"]], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":118.565,"exit_code":0,"observations":[{"actual":[[1,"a"]],"check":"boundary 1","expected":[[1,"a"]],"passed":true},{"actual":[[1,"a"],[2,""],[3,"b"]],"check":"boundary 2","expected":[[1,"a"],[2,""],[3,"b"]],"passed":true},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":[[1,""]],"check":"boundary 4","expected":[[1,""]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [[1, \"a\"]], \"expected\": [[1, \"a\"]], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [[1, \"a\"], [2, \"\"], [3, \"b\"]], \"expected\": [[1, \"a\"], [2, \"\"], [3, \"b\"]], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [[1, \"\"]], \"expected\": [[1, \"\"]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}