{"abstract":"Unicode escape encoding mistakes literal escape text for a character.","category":"Encodings","checks":4,"contract":"Encode Unicode text with Python unicode_escape and return ASCII text.","contract_signature":"x","evaluation_group":"model-3e52ac8fd021a945","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-unicode-escape-double-backslash","id":"FA-3941","implementations":{"attempt":{"sha256":"7f677b62b371c09ceaffd9fec74f409cfda67ace6b3bc5cf34bb5fa24a12ded3","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.encode('ascii','backslashreplace').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('\\\\u0041'), '\\\\\\\\u0041')\ncheck('boundary 2', solve('\\n'), '\\\\n')\ncheck('boundary 3', solve('é'), '\\\\xe9')\ncheck('boundary 4', solve('A'), 'A')\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":"7fc1c942da41fc8e4891563cedc35eef06f38886b485598ba37634912e417bee","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\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('\\\\u0041'), '\\\\\\\\u0041')\ncheck('boundary 2', solve('\\n'), '\\\\n')\ncheck('boundary 3', solve('é'), '\\\\xe9')\ncheck('boundary 4', solve('A'), 'A')\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-unicode-escape-double-backslash","generated_at":"2026-09-29T14:37:33.279572+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: Encode Unicode text with Python unicode_escape and return ASCII text.","sha256":"f5f843c9e4eafbb509af08df229cceaba18d435b2fd075c1622d712689114c58","title":"Unicode escape encoding mistakes literal escape text for a character · 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":62.816,"exit_code":1,"observations":[{"actual":"\\u0041","check":"boundary 1","expected":"\\\\u0041","passed":false},{"actual":"\n","check":"boundary 2","expected":"\\n","passed":false},{"actual":"\\xe9","check":"boundary 3","expected":"\\xe9","passed":true},{"actual":"A","check":"boundary 4","expected":"A","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\\u0041\", \"expected\": \"\\\\\\\\u0041\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\n\", \"expected\": \"\\\\n\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\\\\xe9\", \"expected\": \"\\\\xe9\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":69.706,"exit_code":1,"observations":[{"actual":"\\u0041","check":"boundary 1","expected":"\\\\u0041","passed":false},{"actual":"\n","check":"boundary 2","expected":"\\n","passed":false},{"actual":"é","check":"boundary 3","expected":"\\xe9","passed":false},{"actual":"A","check":"boundary 4","expected":"A","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\\u0041\", \"expected\": \"\\\\\\\\u0041\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\n\", \"expected\": \"\\\\n\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"é\", \"expected\": \"\\\\xe9\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"A\", \"expected\": \"A\", \"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."}}