{"abstract":"Accent removal drops non-Latin letters.","category":"Unicode","checks":4,"contract":"NFD-decompose and remove only characters with nonzero combining class.","evaluation_group":"model-677710336cfe96b1","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-strip-marks-not-symbols","id":"FA-2861","implementations":{"attempt":{"sha256":"bc14271056ae787666c90f26d474fc52f1a9e591b5d2e093dc13d5b92abe9be4","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 ''.join(c for c in unicodedata.normalize('NFD',x) if unicodedata.category(c) != 'Mn')\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('café'), 'cafe')\ncheck('boundary 2', solve('Ω'), 'Ω')\ncheck('boundary 3', solve('️'), '️')\ncheck('boundary 4', solve('á'), '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":"d7847a1227e75000ac5557b024b07500fa55128986e91d0b877f9efc6985dde6","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','ignore').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('café'), 'cafe')\ncheck('boundary 2', solve('Ω'), 'Ω')\ncheck('boundary 3', solve('️'), '️')\ncheck('boundary 4', solve('á'), '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"},"fixed":{"sha256":"8e66f17d104799d3411c39a6b24518e5dee0709c12131f20e780b0ce7765473d","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 ''.join(c for c in unicodedata.normalize('NFD',x) if not unicodedata.combining(c))\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('café'), 'cafe')\ncheck('boundary 2', solve('Ω'), 'Ω')\ncheck('boundary 3', solve('️'), '️')\ncheck('boundary 4', solve('á'), '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-strip-marks-not-symbols","generated_at":"2026-09-29T14:37:18.014612+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: NFD-decompose and remove only characters with nonzero combining class.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: NFD-decompose and remove only characters with nonzero combining class.","sha256":"8a0e70bcf1f340c1642c98c43c9abecdcdd3533782c05909006d087b0fb565dd","title":"Accent removal drops non-Latin letters · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":100.232,"exit_code":1,"observations":[{"actual":"cafe","check":"boundary 1","expected":"cafe","passed":true},{"actual":"Ω","check":"boundary 2","expected":"Ω","passed":true},{"actual":"","check":"boundary 3","expected":"️","passed":false},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"cafe\", \"expected\": \"cafe\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"Ω\", \"expected\": \"Ω\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\", \"expected\": \"️\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":55.582,"exit_code":1,"observations":[{"actual":"caf","check":"boundary 1","expected":"cafe","passed":false},{"actual":"","check":"boundary 2","expected":"Ω","passed":false},{"actual":"","check":"boundary 3","expected":"️","passed":false},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"caf\", \"expected\": \"cafe\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\", \"expected\": \"Ω\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\", \"expected\": \"️\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":49.921,"exit_code":0,"observations":[{"actual":"cafe","check":"boundary 1","expected":"cafe","passed":true},{"actual":"Ω","check":"boundary 2","expected":"Ω","passed":true},{"actual":"️","check":"boundary 3","expected":"️","passed":true},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"cafe\", \"expected\": \"cafe\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"Ω\", \"expected\": \"Ω\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"️\", \"expected\": \"️\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}