{"abstract":"A repr conversion is replaced by ordinary string conversion.","category":"Serialization","checks":4,"contract":"Format value x with repr conversion inside brackets.","evaluation_group":"model-f541b2ce706f572a","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-format-conversion-repr","id":"FA-3826","implementations":{"attempt":{"sha256":"bd544e29b1263d607e23b2342f28cf27d99e9bafea53f54449cdf78cba34a912","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 '['+'\"'+str(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('a'), \"['a']\")\ncheck('boundary 2', solve('\\n'), \"['\\\\n']\")\ncheck('boundary 3', solve(3), '[3]')\ncheck('boundary 4', solve(None), '[None]')\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":"259ba6c2217f6aa43089568bfab1abf885c7d8749b835522138771639009c895","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 '['+str(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('a'), \"['a']\")\ncheck('boundary 2', solve('\\n'), \"['\\\\n']\")\ncheck('boundary 3', solve(3), '[3]')\ncheck('boundary 4', solve(None), '[None]')\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":"2a99ef54a3bf4072189a9ea552961c733c27c7ab039bb2ce897deacad206c307","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 '[{!r}]'.format(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('a'), \"['a']\")\ncheck('boundary 2', solve('\\n'), \"['\\\\n']\")\ncheck('boundary 3', solve(3), '[3]')\ncheck('boundary 4', solve(None), '[None]')\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-format-conversion-repr","generated_at":"2026-09-29T14:37:31.382051+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: Format value x with repr conversion inside brackets.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Format value x with repr conversion inside brackets.","sha256":"b1a9aca85bd64b94074576e4b42048741f78a0c742b680fdacea8624bdad3ce1","title":"A repr conversion is replaced by ordinary string conversion · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":58.55,"exit_code":1,"observations":[{"actual":"[\"a\"]","check":"boundary 1","expected":"['a']","passed":false},{"actual":"[\"\n\"]","check":"boundary 2","expected":"['\\n']","passed":false},{"actual":"[\"3\"]","check":"boundary 3","expected":"[3]","passed":false},{"actual":"[\"None\"]","check":"boundary 4","expected":"[None]","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"[\\\"a\\\"]\", \"expected\": \"['a']\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"[\\\"\\n\\\"]\", \"expected\": \"['\\\\n']\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"[\\\"3\\\"]\", \"expected\": \"[3]\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"[\\\"None\\\"]\", \"expected\": \"[None]\", \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":55.146,"exit_code":1,"observations":[{"actual":"[a]","check":"boundary 1","expected":"['a']","passed":false},{"actual":"[\n]","check":"boundary 2","expected":"['\\n']","passed":false},{"actual":"[3]","check":"boundary 3","expected":"[3]","passed":true},{"actual":"[None]","check":"boundary 4","expected":"[None]","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"[a]\", \"expected\": \"['a']\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"[\\n]\", \"expected\": \"['\\\\n']\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"[3]\", \"expected\": \"[3]\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"[None]\", \"expected\": \"[None]\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":57.903,"exit_code":0,"observations":[{"actual":"['a']","check":"boundary 1","expected":"['a']","passed":true},{"actual":"['\\n']","check":"boundary 2","expected":"['\\n']","passed":true},{"actual":"[3]","check":"boundary 3","expected":"[3]","passed":true},{"actual":"[None]","check":"boundary 4","expected":"[None]","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"['a']\", \"expected\": \"['a']\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"['\\\\n']\", \"expected\": \"['\\\\n']\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"[3]\", \"expected\": \"[3]\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"[None]\", \"expected\": \"[None]\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}