{"abstract":"Whitespace splitting ignores shell quote boundaries.","category":"Tokenization","checks":4,"contract":"Tokenize POSIX shell words without comment processing; perform no expansion.","contract_signature":"x","evaluation_group":"model-22f72513f9d6266e","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-shell-posix-quotes","id":"FA-3261","implementations":{"attempt":{"sha256":"e81f4bcca2d4ae48327f9b5ac73b6e240234ee4ffd9832223dbcc9cbd7711485","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 [v.replace(chr(34),chr(0)).replace(chr(0),chr(32)).strip() for v in x.split()]\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(\"'' x\"), ['', 'x'])\ncheck('boundary 3', solve('a\\\\ b'), ['a b'])\ncheck('boundary 4', solve('x #y'), ['x', '#y'])\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":"f90df1724d8fbb914f08f0747747ee378f531c1c01491b4a2c76a2fe1bbfa78d","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.split()\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(\"'' x\"), ['', 'x'])\ncheck('boundary 3', solve('a\\\\ b'), ['a b'])\ncheck('boundary 4', solve('x #y'), ['x', '#y'])\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-shell-posix-quotes","generated_at":"2026-09-29T14:37:23.516983+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.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Tokenize POSIX shell words without comment processing; perform no expansion.","sha256":"592057aa85411ef0727a1a2dd90155f0d4eb72014a7d05dad37a39e11ddae058","title":"Whitespace splitting ignores shell quote boundaries · 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":54.085,"exit_code":1,"observations":[{"actual":["a","b","c"],"check":"boundary 1","expected":["a","b c"],"passed":false},{"actual":["''","x"],"check":"boundary 2","expected":["","x"],"passed":false},{"actual":["a\\","b"],"check":"boundary 3","expected":["a b"],"passed":false},{"actual":["x","#y"],"check":"boundary 4","expected":["x","#y"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"b\", \"c\"], \"expected\": [\"a\", \"b c\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"''\", \"x\"], \"expected\": [\"\", \"x\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"a\\\\\", \"b\"], \"expected\": [\"a b\"], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"x\", \"#y\"], \"expected\": [\"x\", \"#y\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":58.725,"exit_code":1,"observations":[{"actual":["a","\"b","c\""],"check":"boundary 1","expected":["a","b c"],"passed":false},{"actual":["''","x"],"check":"boundary 2","expected":["","x"],"passed":false},{"actual":["a\\","b"],"check":"boundary 3","expected":["a b"],"passed":false},{"actual":["x","#y"],"check":"boundary 4","expected":["x","#y"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"\\\"b\", \"c\\\"\"], \"expected\": [\"a\", \"b c\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"''\", \"x\"], \"expected\": [\"\", \"x\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"a\\\\\", \"b\"], \"expected\": [\"a b\"], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"x\", \"#y\"], \"expected\": [\"x\", \"#y\"], \"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."}}