{"abstract":"Escaping quotes causes generated backslashes to be escaped twice.","category":"Serialization","checks":4,"contract":"Escape backslash and double quote for a compact quoted-token body.","contract_signature":"x","evaluation_group":"model-03da87b6cb330701","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-escape-backslash-first","id":"FA-3841","implementations":{"attempt":{"sha256":"7c5984ffb83405ac62aa40e08b8a8d08bc8b4cd97f7436a9d01682c3bec6f188","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('\"','\\\\\"')\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\"b'), 'a\\\\\"b')\ncheck('boundary 2', solve('a\\\\b'), 'a\\\\\\\\b')\ncheck('boundary 3', solve('\\\\\"'), '\\\\\\\\\\\\\"')\ncheck('boundary 4', solve('x'), 'x')\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":"0103bc5af11f417e1dcf18cd5047cb25e4a1fa38bf8c522e87d5ac58a1d37871","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('\\\\','\\\\\\\\')\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\"b'), 'a\\\\\"b')\ncheck('boundary 2', solve('a\\\\b'), 'a\\\\\\\\b')\ncheck('boundary 3', solve('\\\\\"'), '\\\\\\\\\\\\\"')\ncheck('boundary 4', solve('x'), 'x')\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-backslash-first","generated_at":"2026-09-29T14:37:31.442535+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 backslash and double quote for a compact quoted-token body.","sha256":"311a72770edc925ea9a9e6dbf592ec099eaa4838d6855d4aaf3006b9106bbf40","title":"Escaping quotes causes generated backslashes to be escaped twice · 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":55.998,"exit_code":1,"observations":[{"actual":"a\\\"b","check":"boundary 1","expected":"a\\\"b","passed":true},{"actual":"a\\b","check":"boundary 2","expected":"a\\\\b","passed":false},{"actual":"\\\\\"","check":"boundary 3","expected":"\\\\\\\"","passed":false},{"actual":"x","check":"boundary 4","expected":"x","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a\\\\\\\"b\", \"expected\": \"a\\\\\\\"b\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"a\\\\b\", \"expected\": \"a\\\\\\\\b\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\\\\\\\\\\\"\", \"expected\": \"\\\\\\\\\\\\\\\"\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":55.717,"exit_code":1,"observations":[{"actual":"a\\\\\"b","check":"boundary 1","expected":"a\\\"b","passed":false},{"actual":"a\\\\b","check":"boundary 2","expected":"a\\\\b","passed":true},{"actual":"\\\\\\\\\"","check":"boundary 3","expected":"\\\\\\\"","passed":false},{"actual":"x","check":"boundary 4","expected":"x","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a\\\\\\\\\\\"b\", \"expected\": \"a\\\\\\\"b\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"a\\\\\\\\b\", \"expected\": \"a\\\\\\\\b\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\\\\\\\\\\\\\\\\\\\"\", \"expected\": \"\\\\\\\\\\\\\\\"\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"x\", \"expected\": \"x\", \"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."}}