{"abstract":"Unknown template fields are deleted.","category":"Serialization","checks":4,"contract":"Substitute $name and ${name} from fixed mapping a=one; unknown names remain literal; $$ emits one dollar.","evaluation_group":"model-120e13b7cab3ce70","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-template-safe-unknown","id":"FA-3816","implementations":{"attempt":{"sha256":"1c539c5c40dcc2396f11c558ba13c3585bae5564f1da80349a32ff9c5aae3d9f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return re.sub(r'\\$\\{?(\\w+)\\}?',lambda m:{'a':'one'}.get(m[1],''),x)\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('$missing'), '$missing')\ncheck('boundary 2', solve('${a} $$'), 'one $')\ncheck('boundary 3', solve('$a'), 'one')\ncheck('boundary 4', solve('plain'), 'plain')\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":"9ca3c67217bfb5b46b2a07f56432e8699f998d528131a999796e79ae7c96689e","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 string.Template(x).substitute({'a':'one'})\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('$missing'), '$missing')\ncheck('boundary 2', solve('${a} $$'), 'one $')\ncheck('boundary 3', solve('$a'), 'one')\ncheck('boundary 4', solve('plain'), 'plain')\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"36fa3723303ddd15894d4d729270e078864dae9e4dd6980b1ab04bf6917ee699","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return string.Template(x).safe_substitute({'a':'one'})\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('$missing'), '$missing')\ncheck('boundary 2', solve('${a} $$'), 'one $')\ncheck('boundary 3', solve('$a'), 'one')\ncheck('boundary 4', solve('plain'), 'plain')\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-template-safe-unknown","generated_at":"2026-09-29T14:37:31.320656+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: Substitute $name and ${name} from fixed mapping a=one; unknown names remain literal; $$ emits one dollar.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Substitute $name and ${name} from fixed mapping a=one; unknown names remain literal; $$ emits one dollar.","sha256":"36b9c720f6118550af587c2a6663acf5c0643e79375b72149f327090372e0d28","title":"Unknown template fields are deleted · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":56.393,"exit_code":1,"observations":[{"actual":"","check":"boundary 1","expected":"$missing","passed":false},{"actual":"one $$","check":"boundary 2","expected":"one $","passed":false},{"actual":"one","check":"boundary 3","expected":"one","passed":true},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\", \"expected\": \"$missing\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"one $$\", \"expected\": \"one $\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"one\", \"expected\": \"one\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":54.078,"exit_code":1,"observations":[{"actual":{"error":"KeyError"},"check":"boundary 1","expected":"$missing","passed":false},{"actual":"one $","check":"boundary 2","expected":"one $","passed":true},{"actual":"one","check":"boundary 3","expected":"one","passed":true},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": {\"error\": \"KeyError\"}, \"expected\": \"$missing\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"one $\", \"expected\": \"one $\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"one\", \"expected\": \"one\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":54.626,"exit_code":0,"observations":[{"actual":"$missing","check":"boundary 1","expected":"$missing","passed":true},{"actual":"one $","check":"boundary 2","expected":"one $","passed":true},{"actual":"one","check":"boundary 3","expected":"one","passed":true},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"$missing\", \"expected\": \"$missing\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"one $\", \"expected\": \"one $\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"one\", \"expected\": \"one\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}