{"abstract":"A terminal line break invents a blank record.","category":"Text processing","checks":4,"contract":"Apply universal Unicode splitlines without retaining terminators.","evaluation_group":"model-67cf5211d57df539","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-splitlines-terminal","id":"FA-3006","implementations":{"attempt":{"sha256":"d16c0f71b50fd2806e8cb0099839a3948f2141e1e3b682865d6d8465bf86f1ac","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 x.rstrip('\\r\\n').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\\r\\nb'), ['a', 'b'])\ncheck('boundary 2', solve('a\\n'), ['a'])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('a\\u2028b'), ['a', 'b'])\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":"591c17fc691faf3fba23f79c9fd749f47ece0ab231b3a97683f0bd774bc0e9ac","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 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\\r\\nb'), ['a', 'b'])\ncheck('boundary 2', solve('a\\n'), ['a'])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('a\\u2028b'), ['a', 'b'])\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":"139c26fffae30cfdf5a37c5a659c303c8dae313956cfeb0cf6418a9e74978f17","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 x.splitlines()\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\\r\\nb'), ['a', 'b'])\ncheck('boundary 2', solve('a\\n'), ['a'])\ncheck('boundary 3', solve(''), [])\ncheck('boundary 4', solve('a\\u2028b'), ['a', 'b'])\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-splitlines-terminal","generated_at":"2026-09-29T14:37:20.012413+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: Apply universal Unicode splitlines without retaining terminators.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Apply universal Unicode splitlines without retaining terminators.","sha256":"067cca0ac8a159627bdbb589b008cff37a3b90962ee400e64a44dab5c9daf5da","title":"A terminal line break invents a blank record · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":50.092,"exit_code":1,"observations":[{"actual":["a\r","b"],"check":"boundary 1","expected":["a","b"],"passed":false},{"actual":["a"],"check":"boundary 2","expected":["a"],"passed":true},{"actual":[""],"check":"boundary 3","expected":[],"passed":false},{"actual":["a
b"],"check":"boundary 4","expected":["a","b"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\\r\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"a\"], \"expected\": [\"a\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"\"], \"expected\": [], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"a
b\"], \"expected\": [\"a\", \"b\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":111.75,"exit_code":1,"observations":[{"actual":["a\r","b"],"check":"boundary 1","expected":["a","b"],"passed":false},{"actual":["a",""],"check":"boundary 2","expected":["a"],"passed":false},{"actual":[""],"check":"boundary 3","expected":[],"passed":false},{"actual":["a
b"],"check":"boundary 4","expected":["a","b"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\\r\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"a\", \"\"], \"expected\": [\"a\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"\"], \"expected\": [], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"a
b\"], \"expected\": [\"a\", \"b\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":53.438,"exit_code":0,"observations":[{"actual":["a","b"],"check":"boundary 1","expected":["a","b"],"passed":true},{"actual":["a"],"check":"boundary 2","expected":["a"],"passed":true},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":["a","b"],"check":"boundary 4","expected":["a","b"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"a\"], \"expected\": [\"a\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}