{"abstract":"Escaped template braces are treated as placeholders.","category":"Serialization","checks":4,"contract":"Apply Python string formatting with a=one, including doubled literal braces.","contract_signature":"x","evaluation_group":"model-d23d0cf48a9a5a59","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-template-brace-escaping","id":"FA-3821","implementations":{"attempt":{"sha256":"e095023a1a5b9ebfd56d461da0390324fe1d60e0d8523e2e5bbadac7c3aa2c05","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('{{','{').replace('}}','}').replace('{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('{{a}}'), '{a}')\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":"35979a1b4a07f1b371da449046abb9540c1a41531415328389ea4839e9a1fcd1","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('{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('{{a}}'), '{a}')\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-brace-escaping","generated_at":"2026-09-29T14:37:31.380563+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: Apply Python string formatting with a=one, including doubled literal braces.","sha256":"8fbeaab3cbf6231e7f7ec30c091ff83b7bcb8914f82ffddd5b345b374461d91c","title":"Escaped template braces are treated as placeholders · 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":56.26,"exit_code":1,"observations":[{"actual":"one","check":"boundary 1","expected":"{a}","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\": \"one\", \"expected\": \"{a}\", \"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"},"broken":{"elapsed_ms":55.084,"exit_code":1,"observations":[{"actual":"{one}","check":"boundary 1","expected":"{a}","passed":false},{"actual":"one","check":"boundary 2","expected":"one","passed":true},{"actual":"{{one}}","check":"boundary 3","expected":"{one}","passed":false},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"{one}\", \"expected\": \"{a}\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"one\", \"expected\": \"one\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"{{one}}\", \"expected\": \"{one}\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"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."}}