{"abstract":"Only the first record header is found.","category":"Regular expressions","checks":4,"contract":"Extract each line containing only an uppercase ASCII name.","evaluation_group":"model-0dfe751bfc29a766","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-regex-multiline-anchors","id":"FA-3116","implementations":{"attempt":{"sha256":"3236d1dbf6f8f84accfab3084fb54fc70a301645580f04a52e7ff625412e4481","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 re.findall(r'[A-Z]+',x)\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('ABC\\nDEF'), ['ABC', 'DEF'])\ncheck('boundary 2', solve('xABC'), [])\ncheck('boundary 3', solve('ABC\\n'), ['ABC'])\ncheck('boundary 4', solve(''), [])\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":"bdbc71876ffe6c9e0a5e60440f488e126dd83966736ae5e811de81fe86696a41","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 re.findall(r'^([A-Z]+)$',x)\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('ABC\\nDEF'), ['ABC', 'DEF'])\ncheck('boundary 2', solve('xABC'), [])\ncheck('boundary 3', solve('ABC\\n'), ['ABC'])\ncheck('boundary 4', solve(''), [])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"719729a4f1f5798f4bf3d3a0b8442bb205f03b212ebc7d10948536e8c86f6e51","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return re.findall(r'^([A-Z]+)$',x,re.MULTILINE)\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('ABC\\nDEF'), ['ABC', 'DEF'])\ncheck('boundary 2', solve('xABC'), [])\ncheck('boundary 3', solve('ABC\\n'), ['ABC'])\ncheck('boundary 4', solve(''), [])\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-regex-multiline-anchors","generated_at":"2026-09-29T14:37:21.634588+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: Extract each line containing only an uppercase ASCII name.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Extract each line containing only an uppercase ASCII name.","sha256":"8afcc873e82ce93caa4349443425c5d41407e253a713e5c0d009b664242e6af1","title":"Only the first record header is found · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":55.364,"exit_code":1,"observations":[{"actual":["ABC","DEF"],"check":"boundary 1","expected":["ABC","DEF"],"passed":true},{"actual":["ABC"],"check":"boundary 2","expected":[],"passed":false},{"actual":["ABC"],"check":"boundary 3","expected":["ABC"],"passed":true},{"actual":[],"check":"boundary 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"ABC\", \"DEF\"], \"expected\": [\"ABC\", \"DEF\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"ABC\"], \"expected\": [], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"ABC\"], \"expected\": [\"ABC\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":56.679,"exit_code":1,"observations":[{"actual":[],"check":"boundary 1","expected":["ABC","DEF"],"passed":false},{"actual":[],"check":"boundary 2","expected":[],"passed":true},{"actual":["ABC"],"check":"boundary 3","expected":["ABC"],"passed":true},{"actual":[],"check":"boundary 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [], \"expected\": [\"ABC\", \"DEF\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"ABC\"], \"expected\": [\"ABC\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":54.372,"exit_code":0,"observations":[{"actual":["ABC","DEF"],"check":"boundary 1","expected":["ABC","DEF"],"passed":true},{"actual":[],"check":"boundary 2","expected":[],"passed":true},{"actual":["ABC"],"check":"boundary 3","expected":["ABC"],"passed":true},{"actual":[],"check":"boundary 4","expected":[],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"ABC\", \"DEF\"], \"expected\": [\"ABC\", \"DEF\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"ABC\"], \"expected\": [\"ABC\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}