{"abstract":"The operation returns a result or retained state that violates this contract: Return true exactly when the operands share no value.","category":"Collection algebra","checks":5,"contract":"Return true exactly when the operands share no value. Inputs are the finite Python values shown by the executable fixtures; no concurrent execution is assumed.","contract_signature":"x, y=None","evaluation_group":"model-0f8da1d51dbafb0c","failed_approach":"Zipping checks only aligned positions and misses cross-position overlaps.","family":"xr-disjointness-ignores-order","id":"FA-4306","implementations":{"attempt":{"sha256":"530300ec44f457746e16678bf775e1aa760fe74e087f2ce08b7f1d35e24b2419","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x, y=None):\n    return all(a != b for a,b in zip(x,y))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('both empty', solve([], []), True)\ncheck('empty right operand', solve(['a'], []), True)\ncheck('empty left operand', solve([], ['b']), True)\ncheck('overlap and multiplicity', solve(['b', 'a', 'b'], ['b', 'c', 'c']), False)\ncheck('overlap at different positions', solve(['a','b'], ['b','c']), False)\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":"52ed7ff7e76add53df27fc2909abec2d2167535883ce641ca2b8e37a4409e00c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x, y=None):\n    return x != y\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('both empty', solve([], []), True)\ncheck('empty right operand', solve(['a'], []), True)\ncheck('empty left operand', solve([], ['b']), True)\ncheck('overlap and multiplicity', solve(['b', 'a', 'b'], ['b', 'c', 'c']), False)\ncheck('overlap at different positions', solve(['a','b'], ['b','c']), False)\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":"xr-disjointness-ignores-order","generated_at":"2026-09-29T14:37:37.824910+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A controlled local-runtime regression for collection APIs, language semantics, or ownership wrappers. Fixtures include boundary and interaction cases.","root_cause":"Sequence inequality is mistaken for absence of shared members.","sha256":"a53f67a3a3a49118aa5e04063c1db4c757d3d1bc9ea0c0376a171e61566383de","title":"Disjointness ignores order · case 01","variant":1,"variant_policy":"Five execution reruns of a fixed adversarial fixture suite; variant number does not alter semantic inputs.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":41.777,"exit_code":1,"observations":[{"actual":true,"check":"both empty","expected":true,"passed":true},{"actual":true,"check":"empty right operand","expected":true,"passed":true},{"actual":true,"check":"empty left operand","expected":true,"passed":true},{"actual":false,"check":"overlap and multiplicity","expected":false,"passed":true},{"actual":true,"check":"overlap at different positions","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"both empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty right operand\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty left operand\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"overlap and multiplicity\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"overlap at different positions\", \"actual\": true, \"expected\": false, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.106,"exit_code":1,"observations":[{"actual":false,"check":"both empty","expected":true,"passed":false},{"actual":true,"check":"empty right operand","expected":true,"passed":true},{"actual":true,"check":"empty left operand","expected":true,"passed":true},{"actual":true,"check":"overlap and multiplicity","expected":false,"passed":false},{"actual":true,"check":"overlap at different positions","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"both empty\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"empty right operand\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty left operand\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"overlap and multiplicity\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"overlap at different positions\", \"actual\": true, \"expected\": false, \"passed\": false}], \"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."}}