{"abstract":"A qualified label splits at its first colon.","category":"Text processing","checks":4,"contract":"Split on the final colon; if missing return empty qualifier and whole label.","evaluation_group":"model-51d5ea6d12835bd6","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-rpartition-last","id":"FA-2991","implementations":{"attempt":{"sha256":"f129c027d804350a0583172073a7e04bd9e86addd6c59411b2ea1cf85b7eb22c","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.rsplit(':',1) if ':' in x else [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('a:b:c'), ['a:b', 'c'])\ncheck('boundary 2', solve('name'), ['', 'name'])\ncheck('boundary 3', solve(':x'), ['', 'x'])\ncheck('boundary 4', solve('x:'), ['x', ''])\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":"3ac2a80d426bb8f5f610c572ba0b37f4a7e128b164a6e0c290eddf0249570a67","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.partition(':')[0],x.partition(':')[2]]\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('a:b:c'), ['a:b', 'c'])\ncheck('boundary 2', solve('name'), ['', 'name'])\ncheck('boundary 3', solve(':x'), ['', 'x'])\ncheck('boundary 4', solve('x:'), ['x', ''])\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":"c558eebec0051505ab086b993cf4071737ab2df5116a8b056a45140f935255b0","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.rpartition(':')[0],x.rpartition(':')[2]]\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('a:b:c'), ['a:b', 'c'])\ncheck('boundary 2', solve('name'), ['', 'name'])\ncheck('boundary 3', solve(':x'), ['', 'x'])\ncheck('boundary 4', solve('x:'), ['x', ''])\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-rpartition-last","generated_at":"2026-09-29T14:37:19.908123+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: Split on the final colon; if missing return empty qualifier and whole label.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Split on the final colon; if missing return empty qualifier and whole label.","sha256":"9cf6fb1cbfdb3d663b8a9d5a570ef856ffeaa66490c06cc7f0a0b155e6230f70","title":"A qualified label splits at its first colon · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":52.925,"exit_code":1,"observations":[{"actual":["a:b","c"],"check":"boundary 1","expected":["a:b","c"],"passed":true},{"actual":["name",""],"check":"boundary 2","expected":["","name"],"passed":false},{"actual":["","x"],"check":"boundary 3","expected":["","x"],"passed":true},{"actual":["x",""],"check":"boundary 4","expected":["x",""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a:b\", \"c\"], \"expected\": [\"a:b\", \"c\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"name\", \"\"], \"expected\": [\"\", \"name\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"\", \"x\"], \"expected\": [\"\", \"x\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"x\", \"\"], \"expected\": [\"x\", \"\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":61.177,"exit_code":1,"observations":[{"actual":["a","b:c"],"check":"boundary 1","expected":["a:b","c"],"passed":false},{"actual":["name",""],"check":"boundary 2","expected":["","name"],"passed":false},{"actual":["","x"],"check":"boundary 3","expected":["","x"],"passed":true},{"actual":["x",""],"check":"boundary 4","expected":["x",""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"b:c\"], \"expected\": [\"a:b\", \"c\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"name\", \"\"], \"expected\": [\"\", \"name\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"\", \"x\"], \"expected\": [\"\", \"x\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"x\", \"\"], \"expected\": [\"x\", \"\"], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":113.013,"exit_code":0,"observations":[{"actual":["a:b","c"],"check":"boundary 1","expected":["a:b","c"],"passed":true},{"actual":["","name"],"check":"boundary 2","expected":["","name"],"passed":true},{"actual":["","x"],"check":"boundary 3","expected":["","x"],"passed":true},{"actual":["x",""],"check":"boundary 4","expected":["x",""],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a:b\", \"c\"], \"expected\": [\"a:b\", \"c\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"\", \"name\"], \"expected\": [\"\", \"name\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"\", \"x\"], \"expected\": [\"\", \"x\"], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"x\", \"\"], \"expected\": [\"x\", \"\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}