{"abstract":"The rotation direction is reversed.","category":"Planar geometry","checks":4,"contract":"Integer coordinates and lengths, with exact arithmetic except for indicated division results. Lengths are nonnegative. Rectangles are (xmin,ymin,xmax,ymax) with ordered bounds; coordinate vectors have matching dimensions. Counterclockwise quarter turn. Exact operational definition: (-point[1],point[0])","contract_signature":"point","evaluation_group":"model-e15ca96c191df5e0","failed_approach":"Negating both coordinates rotates by a half turn.","family":"xn-counterclockwise-quarter-turn","id":"FA-5851","implementations":{"attempt":{"sha256":"28c45a2125de0910fec066d110af8ec894c6e32f8e5fd4fdb710eca7d484a038","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nimport calendar\nimport statistics\nimport itertools\nfrom fractions import Fraction\nfrom datetime import date, datetime, timedelta, timezone\nfrom decimal import Decimal, ROUND_HALF_UP, ROUND_DOWN, ROUND_CEILING, ROUND_FLOOR\n\nN = 1\nobservations = []\ndef solve(point):\n    return (-point[0],-point[1])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1: ((2, 3),)', solve(*((2, 3),)), (-3, 2))\ncheck('fixture 2: ((0, 1),)', solve(*((0, 1),)), (-1, 0))\ncheck('fixture 3: ((-2, 0),)', solve(*((-2, 0),)), (0, -2))\ncheck('fixture 4: ((0, 0),)', solve(*((0, 0),)), (0, 0))\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":"b2d8406cd597888552a541cb24ad3ed4ed225f8efd0232056dc27fc40767989c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nimport calendar\nimport statistics\nimport itertools\nfrom fractions import Fraction\nfrom datetime import date, datetime, timedelta, timezone\nfrom decimal import Decimal, ROUND_HALF_UP, ROUND_DOWN, ROUND_CEILING, ROUND_FLOOR\n\nN = 1\nobservations = []\ndef solve(point):\n    return (point[1],-point[0])\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1: ((2, 3),)', solve(*((2, 3),)), (-3, 2))\ncheck('fixture 2: ((0, 1),)', solve(*((0, 1),)), (-1, 0))\ncheck('fixture 3: ((-2, 0),)', solve(*((-2, 0),)), (0, -2))\ncheck('fixture 4: ((0, 0),)', solve(*((0, 0),)), (0, 0))\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":"xn-counterclockwise-quarter-turn","generated_at":"2026-09-29T14:37:54.482478+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Small exact fixtures expose this error without platform timing, external services, or probabilistic observations. Planar geometry results depend on the stated convention.","root_cause":"The rotation direction is reversed.","sha256":"2e581fe958de072ad6dab17d3e8e7b7a36c3b72f26ab90abb77419ec02659212","title":"Counterclockwise quarter turn · 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":50.445,"exit_code":1,"observations":[{"actual":[-2,-3],"check":"fixture 1: ((2, 3),)","expected":[-3,2],"passed":false},{"actual":[0,-1],"check":"fixture 2: ((0, 1),)","expected":[-1,0],"passed":false},{"actual":[2,0],"check":"fixture 3: ((-2, 0),)","expected":[0,-2],"passed":false},{"actual":[0,0],"check":"fixture 4: ((0, 0),)","expected":[0,0],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: ((2, 3),)\", \"actual\": [-2, -3], \"expected\": [-3, 2], \"passed\": false}, {\"check\": \"fixture 2: ((0, 1),)\", \"actual\": [0, -1], \"expected\": [-1, 0], \"passed\": false}, {\"check\": \"fixture 3: ((-2, 0),)\", \"actual\": [2, 0], \"expected\": [0, -2], \"passed\": false}, {\"check\": \"fixture 4: ((0, 0),)\", \"actual\": [0, 0], \"expected\": [0, 0], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":54.012,"exit_code":1,"observations":[{"actual":[3,-2],"check":"fixture 1: ((2, 3),)","expected":[-3,2],"passed":false},{"actual":[1,0],"check":"fixture 2: ((0, 1),)","expected":[-1,0],"passed":false},{"actual":[0,2],"check":"fixture 3: ((-2, 0),)","expected":[0,-2],"passed":false},{"actual":[0,0],"check":"fixture 4: ((0, 0),)","expected":[0,0],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: ((2, 3),)\", \"actual\": [3, -2], \"expected\": [-3, 2], \"passed\": false}, {\"check\": \"fixture 2: ((0, 1),)\", \"actual\": [1, 0], \"expected\": [-1, 0], \"passed\": false}, {\"check\": \"fixture 3: ((-2, 0),)\", \"actual\": [0, 2], \"expected\": [0, -2], \"passed\": false}, {\"check\": \"fixture 4: ((0, 0),)\", \"actual\": [0, 0], \"expected\": [0, 0], \"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."}}