{"abstract":"Inclusive matching returns the current day under a strictly-next contract.","category":"Calendar arithmetic","checks":4,"contract":"Valid ISO Gregorian dates in years 1 through 9999; generated dates must remain in that range. Month is 1 through 12 and zero-based weekday is Monday 0 through Sunday 6 unless the output convention says otherwise. Strictly next weekday. Exact operational definition: (date.fromisoformat(text)+timedelta(days=(weekday-date.fromisoformat(text).weekday())%7 or 7)).isoformat()","evaluation_group":"model-7412bd69004c311f","failed_approach":"Absolute weekday distance loses forward week wrap.","family":"xn-strictly-next-weekday","id":"FA-6536","implementations":{"attempt":{"sha256":"f88e22ba2d6c6c26df7cb72e91380894a4233ee9ed7b3388feb541d088e274c7","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(text, weekday):\n    return (date.fromisoformat(text)+timedelta(days=abs(weekday-date.fromisoformat(text).weekday()))).isoformat()\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck(\"fixture 1: ('2024-01-01', 0)\", solve(*('2024-01-01', 0)), '2024-01-08')\ncheck(\"fixture 2: ('2024-01-05', 0)\", solve(*('2024-01-05', 0)), '2024-01-08')\ncheck(\"fixture 3: ('2024-01-01', 4)\", solve(*('2024-01-01', 4)), '2024-01-05')\ncheck(\"fixture 4: ('2024-12-31', 2)\", solve(*('2024-12-31', 2)), '2025-01-01')\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":"f7721ecb3ca686055b55ee505577b52f2bd9360f107af45422a18425206ac729","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(text, weekday):\n    return (date.fromisoformat(text)+timedelta(days=(weekday-date.fromisoformat(text).weekday())%7)).isoformat()\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck(\"fixture 1: ('2024-01-01', 0)\", solve(*('2024-01-01', 0)), '2024-01-08')\ncheck(\"fixture 2: ('2024-01-05', 0)\", solve(*('2024-01-05', 0)), '2024-01-08')\ncheck(\"fixture 3: ('2024-01-01', 4)\", solve(*('2024-01-01', 4)), '2024-01-05')\ncheck(\"fixture 4: ('2024-12-31', 2)\", solve(*('2024-12-31', 2)), '2025-01-01')\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"},"fixed":{"sha256":"fe25f8e97b3e5063e10d813f9520bfc9787082420fbab827a59b77806a1226b9","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(text, weekday):\n    return (date.fromisoformat(text)+timedelta(days=(weekday-date.fromisoformat(text).weekday())%7 or 7)).isoformat()\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck(\"fixture 1: ('2024-01-01', 0)\", solve(*('2024-01-01', 0)), '2024-01-08')\ncheck(\"fixture 2: ('2024-01-05', 0)\", solve(*('2024-01-05', 0)), '2024-01-08')\ncheck(\"fixture 3: ('2024-01-01', 4)\", solve(*('2024-01-01', 4)), '2024-01-05')\ncheck(\"fixture 4: ('2024-12-31', 2)\", solve(*('2024-12-31', 2)), '2025-01-01')\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-strictly-next-weekday","generated_at":"2026-09-29T14:38:03.032990+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. Calendar conventions results depend on the stated convention.","repair":"Apply the specified mathematical contract directly, preserving all terms and boundary cases: return (date.fromisoformat(text)+timedelta(days=(weekday-date.fromisoformat(text).weekday())%7 or 7)).isoformat()","root_cause":"Inclusive matching returns the current day under a strictly-next contract.","sha256":"613f92126fb1f5947c3b131e27416ece6e14629adc9854cf52ef6918e6905023","title":"Strictly next weekday · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":44.968,"exit_code":1,"observations":[{"actual":"2024-01-01","check":"fixture 1: ('2024-01-01', 0)","expected":"2024-01-08","passed":false},{"actual":"2024-01-09","check":"fixture 2: ('2024-01-05', 0)","expected":"2024-01-08","passed":false},{"actual":"2024-01-05","check":"fixture 3: ('2024-01-01', 4)","expected":"2024-01-05","passed":true},{"actual":"2025-01-01","check":"fixture 4: ('2024-12-31', 2)","expected":"2025-01-01","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: ('2024-01-01', 0)\", \"actual\": \"2024-01-01\", \"expected\": \"2024-01-08\", \"passed\": false}, {\"check\": \"fixture 2: ('2024-01-05', 0)\", \"actual\": \"2024-01-09\", \"expected\": \"2024-01-08\", \"passed\": false}, {\"check\": \"fixture 3: ('2024-01-01', 4)\", \"actual\": \"2024-01-05\", \"expected\": \"2024-01-05\", \"passed\": true}, {\"check\": \"fixture 4: ('2024-12-31', 2)\", \"actual\": \"2025-01-01\", \"expected\": \"2025-01-01\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.057,"exit_code":1,"observations":[{"actual":"2024-01-01","check":"fixture 1: ('2024-01-01', 0)","expected":"2024-01-08","passed":false},{"actual":"2024-01-08","check":"fixture 2: ('2024-01-05', 0)","expected":"2024-01-08","passed":true},{"actual":"2024-01-05","check":"fixture 3: ('2024-01-01', 4)","expected":"2024-01-05","passed":true},{"actual":"2025-01-01","check":"fixture 4: ('2024-12-31', 2)","expected":"2025-01-01","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: ('2024-01-01', 0)\", \"actual\": \"2024-01-01\", \"expected\": \"2024-01-08\", \"passed\": false}, {\"check\": \"fixture 2: ('2024-01-05', 0)\", \"actual\": \"2024-01-08\", \"expected\": \"2024-01-08\", \"passed\": true}, {\"check\": \"fixture 3: ('2024-01-01', 4)\", \"actual\": \"2024-01-05\", \"expected\": \"2024-01-05\", \"passed\": true}, {\"check\": \"fixture 4: ('2024-12-31', 2)\", \"actual\": \"2025-01-01\", \"expected\": \"2025-01-01\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":43.971,"exit_code":0,"observations":[{"actual":"2024-01-08","check":"fixture 1: ('2024-01-01', 0)","expected":"2024-01-08","passed":true},{"actual":"2024-01-08","check":"fixture 2: ('2024-01-05', 0)","expected":"2024-01-08","passed":true},{"actual":"2024-01-05","check":"fixture 3: ('2024-01-01', 4)","expected":"2024-01-05","passed":true},{"actual":"2025-01-01","check":"fixture 4: ('2024-12-31', 2)","expected":"2025-01-01","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1: ('2024-01-01', 0)\", \"actual\": \"2024-01-08\", \"expected\": \"2024-01-08\", \"passed\": true}, {\"check\": \"fixture 2: ('2024-01-05', 0)\", \"actual\": \"2024-01-08\", \"expected\": \"2024-01-08\", \"passed\": true}, {\"check\": \"fixture 3: ('2024-01-01', 4)\", \"actual\": \"2024-01-05\", \"expected\": \"2024-01-05\", \"passed\": true}, {\"check\": \"fixture 4: ('2024-12-31', 2)\", \"actual\": \"2025-01-01\", \"expected\": \"2025-01-01\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}