{"abstract":"A zero-class mark survives mark stripping.","category":"Unicode","checks":4,"contract":"Remove every Unicode M-category code point without decomposing text.","evaluation_group":"model-536108ceaa3ce414","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-combining-vs-mark","id":"FA-2921","implementations":{"attempt":{"sha256":"2422459c4936f0fff4417a1f34982c950ffba07928c88d81fdc7c9d42ecfa658","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 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('a️'), 'a')\ncheck('boundary 2', solve('का'), 'क')\ncheck('boundary 3', solve('é'), 'é')\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":"54d0cdac366dbaa52848812b5f78b899ac69aca5bb67ba7870986377a0a87ae3","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 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('a️'), 'a')\ncheck('boundary 2', solve('का'), 'क')\ncheck('boundary 3', solve('é'), 'é')\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":"0beac7e378b97b4b183858ad1909f2bff0c4d3dbe7f95a57daee1c834cf88faf","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 x if not unicodedata.category(c).startswith('M'))\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('a️'), 'a')\ncheck('boundary 2', solve('का'), 'क')\ncheck('boundary 3', solve('é'), 'é')\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-combining-vs-mark","generated_at":"2026-09-29T14:37:18.854597+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: Remove every Unicode M-category code point without decomposing text.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Remove every Unicode M-category code point without decomposing text.","sha256":"1a6c1ff4e467e7635ade83127080538e4536477d7ec295601773556b3582f444","title":"A zero-class mark survives mark stripping · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":51.455,"exit_code":1,"observations":[{"actual":"a","check":"boundary 1","expected":"a","passed":true},{"actual":"का","check":"boundary 2","expected":"क","passed":false},{"actual":"é","check":"boundary 3","expected":"é","passed":true},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"का\", \"expected\": \"क\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"é\", \"expected\": \"é\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":53.142,"exit_code":1,"observations":[{"actual":"a️","check":"boundary 1","expected":"a","passed":false},{"actual":"का","check":"boundary 2","expected":"क","passed":false},{"actual":"é","check":"boundary 3","expected":"é","passed":true},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a️\", \"expected\": \"a\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"का\", \"expected\": \"क\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"é\", \"expected\": \"é\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":53.65,"exit_code":0,"observations":[{"actual":"a","check":"boundary 1","expected":"a","passed":true},{"actual":"क","check":"boundary 2","expected":"क","passed":true},{"actual":"é","check":"boundary 3","expected":"é","passed":true},{"actual":"a","check":"boundary 4","expected":"a","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"क\", \"expected\": \"क\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"é\", \"expected\": \"é\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}