{"abstract":"Substring frequency counts overlapping matches.","category":"Text processing","checks":4,"contract":"Count nonoverlapping occurrences of aa, using Python substring count semantics.","evaluation_group":"model-d4a6335a166a4a9a","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-count-nonoverlap","id":"FA-3021","implementations":{"attempt":{"sha256":"07a8e8432371e33f80c401f2c5e750bb6b33e436a997a0a4b6eb6b0fcf867048","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 int('aa' in x)\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('aaa'), 1)\ncheck('boundary 2', solve('aaaa'), 2)\ncheck('boundary 3', solve('aabaa'), 2)\ncheck('boundary 4', solve(''), 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":"678838e78a4dde6565a1762f0673a4dd49a69446e4837b0de86c3e33425f1e19","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 sum(x[i:i+2]=='aa' for i in range(len(x)))\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('aaa'), 1)\ncheck('boundary 2', solve('aaaa'), 2)\ncheck('boundary 3', solve('aabaa'), 2)\ncheck('boundary 4', solve(''), 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"},"fixed":{"sha256":"54b6e73cc76e51dcf40f4445a99c5968c63d5891401a990206ba7577820085bc","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.count('aa')\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('aaa'), 1)\ncheck('boundary 2', solve('aaaa'), 2)\ncheck('boundary 3', solve('aabaa'), 2)\ncheck('boundary 4', solve(''), 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":"xp-count-nonoverlap","generated_at":"2026-09-29T14:37:20.462739+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.","repair":"Implement the complete stated contract, including the boundary fixtures: Count nonoverlapping occurrences of aa, using Python substring count semantics.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Count nonoverlapping occurrences of aa, using Python substring count semantics.","sha256":"d197dffda25ae8da2db5c8e79f1c907dca54c90bcd630b30008c0bab396a0b8d","title":"Substring frequency counts overlapping matches · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":57.289,"exit_code":1,"observations":[{"actual":1,"check":"boundary 1","expected":1,"passed":true},{"actual":1,"check":"boundary 2","expected":2,"passed":false},{"actual":1,"check":"boundary 3","expected":2,"passed":false},{"actual":0,"check":"boundary 4","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": 1, \"expected\": 2, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": 1, \"expected\": 2, \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":54.085,"exit_code":1,"observations":[{"actual":2,"check":"boundary 1","expected":1,"passed":false},{"actual":3,"check":"boundary 2","expected":2,"passed":false},{"actual":2,"check":"boundary 3","expected":2,"passed":true},{"actual":0,"check":"boundary 4","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": 3, \"expected\": 2, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":55.43,"exit_code":0,"observations":[{"actual":1,"check":"boundary 1","expected":1,"passed":true},{"actual":2,"check":"boundary 2","expected":2,"passed":true},{"actual":2,"check":"boundary 3","expected":2,"passed":true},{"actual":0,"check":"boundary 4","expected":0,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}