{"abstract":"Non-ASCII diagnostic characters remain literal.","category":"Serialization","checks":4,"contract":"Return ASCII-only repr with standard backslash escapes.","contract_signature":"x","evaluation_group":"model-2f47f068c23ee82e","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-ascii-escape-not-repr","id":"FA-3071","implementations":{"attempt":{"sha256":"7b02787dbf2e7e683cbed3ebb467534d344ff4a4b14e2fec34ffe8c4e7186c98","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 repr(x.encode('unicode_escape').decode())\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('é'), \"'\\\\xe9'\")\ncheck('boundary 2', solve('😀'), \"'\\\\U0001f600'\")\ncheck('boundary 3', solve('a'), \"'a'\")\ncheck('boundary 4', solve('\\n'), \"'\\\\n'\")\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":"6c2bcd76315e40a2e7117618aa08b81b7db1fc79c88a7f34ea33febf401d1637","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 repr(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('é'), \"'\\\\xe9'\")\ncheck('boundary 2', solve('😀'), \"'\\\\U0001f600'\")\ncheck('boundary 3', solve('a'), \"'a'\")\ncheck('boundary 4', solve('\\n'), \"'\\\\n'\")\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-ascii-escape-not-repr","generated_at":"2026-09-29T14:37:20.820217+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.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Return ASCII-only repr with standard backslash escapes.","sha256":"0423b0556495aaceeba4ed1178304245c1f4aaf8f39b14cd61d69b3afd681ca5","title":"Non-ASCII diagnostic characters remain literal · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":61.396,"exit_code":1,"observations":[{"actual":"'\\\\xe9'","check":"boundary 1","expected":"'\\xe9'","passed":false},{"actual":"'\\\\U0001f600'","check":"boundary 2","expected":"'\\U0001f600'","passed":false},{"actual":"'a'","check":"boundary 3","expected":"'a'","passed":true},{"actual":"'\\\\n'","check":"boundary 4","expected":"'\\n'","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"'\\\\\\\\xe9'\", \"expected\": \"'\\\\xe9'\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"'\\\\\\\\U0001f600'\", \"expected\": \"'\\\\U0001f600'\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"'a'\", \"expected\": \"'a'\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"'\\\\\\\\n'\", \"expected\": \"'\\\\n'\", \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":57.78,"exit_code":1,"observations":[{"actual":"'é'","check":"boundary 1","expected":"'\\xe9'","passed":false},{"actual":"'😀'","check":"boundary 2","expected":"'\\U0001f600'","passed":false},{"actual":"'a'","check":"boundary 3","expected":"'a'","passed":true},{"actual":"'\\n'","check":"boundary 4","expected":"'\\n'","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"'é'\", \"expected\": \"'\\\\xe9'\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"'😀'\", \"expected\": \"'\\\\U0001f600'\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"'a'\", \"expected\": \"'a'\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"'\\\\n'\", \"expected\": \"'\\\\n'\", \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}