{"abstract":"An equals sign in quoted text becomes the assignment operator.","category":"Parsing","checks":4,"contract":"Split at first equals outside double quotes; return [whole,None] if absent. No quote escapes.","contract_signature":"x","evaluation_group":"model-cae3d0eab9f2dc8e","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-split-assignment-quoted","id":"FA-3856","implementations":{"attempt":{"sha256":"b92449f276e163a16928bef81f7ee355574f50068d30bcf881738227ce20b635","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.rsplit('=',1) if '=' in x else [x,None]\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\"=c'), ['\"a=b\"', 'c'])\ncheck('boundary 2', solve('a=\"b=c\"'), ['a', '\"b=c\"'])\ncheck('boundary 3', solve('abc'), ['abc', None])\ncheck('boundary 4', solve('a='), ['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":"723b23ec50515de902fa5df5f72f1e7c7545e763f36d58354dfe2ded25ce45bd","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.partition('=')[0],x.partition('=')[2]]\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\"=c'), ['\"a=b\"', 'c'])\ncheck('boundary 2', solve('a=\"b=c\"'), ['a', '\"b=c\"'])\ncheck('boundary 3', solve('abc'), ['abc', None])\ncheck('boundary 4', solve('a='), ['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-split-assignment-quoted","generated_at":"2026-09-29T14:37:31.968477+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: Split at first equals outside double quotes; return [whole,None] if absent. No quote escapes.","sha256":"062f27f2808f6ec9dedb7dbcb3b09876850a63dca07ffb3f3c1a68e0070f5962","title":"An equals sign in quoted text becomes the assignment operator · 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":57.304,"exit_code":1,"observations":[{"actual":["\"a=b\"","c"],"check":"boundary 1","expected":["\"a=b\"","c"],"passed":true},{"actual":["a=\"b","c\""],"check":"boundary 2","expected":["a","\"b=c\""],"passed":false},{"actual":["abc",null],"check":"boundary 3","expected":["abc",null],"passed":true},{"actual":["a",""],"check":"boundary 4","expected":["a",""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"\\\"a=b\\\"\", \"c\"], \"expected\": [\"\\\"a=b\\\"\", \"c\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"a=\\\"b\", \"c\\\"\"], \"expected\": [\"a\", \"\\\"b=c\\\"\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"abc\", null], \"expected\": [\"abc\", null], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"a\", \"\"], \"expected\": [\"a\", \"\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":58.969,"exit_code":1,"observations":[{"actual":["\"a","b\"=c"],"check":"boundary 1","expected":["\"a=b\"","c"],"passed":false},{"actual":["a","\"b=c\""],"check":"boundary 2","expected":["a","\"b=c\""],"passed":true},{"actual":["abc",""],"check":"boundary 3","expected":["abc",null],"passed":false},{"actual":["a",""],"check":"boundary 4","expected":["a",""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"\\\"a\", \"b\\\"=c\"], \"expected\": [\"\\\"a=b\\\"\", \"c\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"a\", \"\\\"b=c\\\"\"], \"expected\": [\"a\", \"\\\"b=c\\\"\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"abc\", \"\"], \"expected\": [\"abc\", null], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"a\", \"\"], \"expected\": [\"a\", \"\"], \"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."}}