{"abstract":"Area is returned instead of perimeter.","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. Rectangle perimeter. Exact operational definition: 2*(w+h)","contract_signature":"w, h","evaluation_group":"model-69a2df691218427e","failed_approach":"Only two of the four sides are counted.","family":"xn-rectangle-perimeter","id":"FA-5821","implementations":{"attempt":{"sha256":"c62db4c8a993bc7cf3a96b0785b0c996ad151324600fb62b184f84797d807bc4","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(w, h):\n    return w+h\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1: (3, 4)', solve(*(3, 4)), 14)\ncheck('fixture 2: (0, 5)', solve(*(0, 5)), 10)\ncheck('fixture 3: (2, 2)', solve(*(2, 2)), 8)\ncheck('fixture 4: (0, 0)', solve(*(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":"084ac35d1af9e21a90ef61e57179359d67486ca930cf53d11aa8f986ba99470d","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(w, h):\n    return w*h\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1: (3, 4)', solve(*(3, 4)), 14)\ncheck('fixture 2: (0, 5)', solve(*(0, 5)), 10)\ncheck('fixture 3: (2, 2)', solve(*(2, 2)), 8)\ncheck('fixture 4: (0, 0)', solve(*(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-rectangle-perimeter","generated_at":"2026-09-29T14:37:54.287112+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":"Area is returned instead of perimeter.","sha256":"8043b92c81340f02cd62e6fc2a7eba7ecc31d7b09551b5e367132c09fdefea55","title":"Rectangle perimeter · 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":58.596,"exit_code":1,"observations":[{"actual":7,"check":"fixture 1: (3, 4)","expected":14,"passed":false},{"actual":5,"check":"fixture 2: (0, 5)","expected":10,"passed":false},{"actual":4,"check":"fixture 3: (2, 2)","expected":8,"passed":false},{"actual":0,"check":"fixture 4: (0, 0)","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: (3, 4)\", \"actual\": 7, \"expected\": 14, \"passed\": false}, {\"check\": \"fixture 2: (0, 5)\", \"actual\": 5, \"expected\": 10, \"passed\": false}, {\"check\": \"fixture 3: (2, 2)\", \"actual\": 4, \"expected\": 8, \"passed\": false}, {\"check\": \"fixture 4: (0, 0)\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":56.339,"exit_code":1,"observations":[{"actual":12,"check":"fixture 1: (3, 4)","expected":14,"passed":false},{"actual":0,"check":"fixture 2: (0, 5)","expected":10,"passed":false},{"actual":4,"check":"fixture 3: (2, 2)","expected":8,"passed":false},{"actual":0,"check":"fixture 4: (0, 0)","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: (3, 4)\", \"actual\": 12, \"expected\": 14, \"passed\": false}, {\"check\": \"fixture 2: (0, 5)\", \"actual\": 0, \"expected\": 10, \"passed\": false}, {\"check\": \"fixture 3: (2, 2)\", \"actual\": 4, \"expected\": 8, \"passed\": false}, {\"check\": \"fixture 4: (0, 0)\", \"actual\": 0, \"expected\": 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."}}