{"abstract":"HTML escaping double-escapes the entities it just generated.","category":"Markup","checks":4,"contract":"Escape only ampersand and less-than once from original text.","contract_signature":"x","evaluation_group":"model-ef902969b2f32b51","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-escape-html-order","id":"FA-4041","implementations":{"attempt":{"sha256":"ddb181f3f4d2256e0f2bbeac2e1851159b73eb5fd99e74277425582946e91eb1","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.replace('<','&lt;')\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('<'), '&lt;')\ncheck('boundary 2', solve('&'), '&amp;')\ncheck('boundary 3', solve('&lt;'), '&amp;lt;')\ncheck('boundary 4', solve('a>b'), 'a>b')\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":"388cf91212cc0ab5974c43f3e94a862e52a925942ddfcd902f1a74be06b2de1b","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.replace('<','&lt;').replace('&','&amp;')\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('<'), '&lt;')\ncheck('boundary 2', solve('&'), '&amp;')\ncheck('boundary 3', solve('&lt;'), '&amp;lt;')\ncheck('boundary 4', solve('a>b'), 'a>b')\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-escape-html-order","generated_at":"2026-09-29T14:37:34.769767+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: Escape only ampersand and less-than once from original text.","sha256":"d9ae21f4e61264582021c10cee26bbef87272bbba2260582ab3d4d74042ba04a","title":"HTML escaping double-escapes the entities it just generated · 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":62.613,"exit_code":1,"observations":[{"actual":"&lt;","check":"boundary 1","expected":"&lt;","passed":true},{"actual":"&","check":"boundary 2","expected":"&amp;","passed":false},{"actual":"&lt;","check":"boundary 3","expected":"&amp;lt;","passed":false},{"actual":"a>b","check":"boundary 4","expected":"a>b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"&lt;\", \"expected\": \"&lt;\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"&\", \"expected\": \"&amp;\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"&lt;\", \"expected\": \"&amp;lt;\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"a>b\", \"expected\": \"a>b\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":63.587,"exit_code":1,"observations":[{"actual":"&amp;lt;","check":"boundary 1","expected":"&lt;","passed":false},{"actual":"&amp;","check":"boundary 2","expected":"&amp;","passed":true},{"actual":"&amp;lt;","check":"boundary 3","expected":"&amp;lt;","passed":true},{"actual":"a>b","check":"boundary 4","expected":"a>b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"&amp;lt;\", \"expected\": \"&lt;\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"&amp;\", \"expected\": \"&amp;\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"&amp;lt;\", \"expected\": \"&amp;lt;\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a>b\", \"expected\": \"a>b\", \"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."}}