{"abstract":"A physical continuation inserts a semantic space.","category":"Parsing","checks":4,"contract":"Remove every literal backslash-LF pair before interpreting any other text.","evaluation_group":"model-6d4a673ee988ed8d","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-join-continuation-no-space","id":"FA-3791","implementations":{"attempt":{"sha256":"3bf50a1296add91e51422dc07c6edf29070961da39b4d542faa15a6c2d3825e8","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.replace(chr(92),'').replace(chr(10),'')\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('ab\\\\\\ncd'), 'abcd')\ncheck('boundary 2', solve('a\\nb'), 'a\\nb')\ncheck('boundary 3', solve('a\\\\b'), 'a\\\\b')\ncheck('boundary 4', solve(''), '')\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":"d90897d3cf9bc410b4d034c77e26b91de5b8a3682fb53c835a2fd04f5458ee95","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.replace(chr(92)+chr(10),' ')\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('ab\\\\\\ncd'), 'abcd')\ncheck('boundary 2', solve('a\\nb'), 'a\\nb')\ncheck('boundary 3', solve('a\\\\b'), 'a\\\\b')\ncheck('boundary 4', solve(''), '')\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":"643c00cca4acf8d6a3ec606fc3c291e48cdfb6da6c83b6baaa6f42659ffbf420","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.replace(chr(92)+chr(10),'')\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('ab\\\\\\ncd'), 'abcd')\ncheck('boundary 2', solve('a\\nb'), 'a\\nb')\ncheck('boundary 3', solve('a\\\\b'), 'a\\\\b')\ncheck('boundary 4', solve(''), '')\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-join-continuation-no-space","generated_at":"2026-09-29T14:37:31.155759+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: Remove every literal backslash-LF pair before interpreting any other text.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Remove every literal backslash-LF pair before interpreting any other text.","sha256":"ae36877d65090f1471a8bfba94f9db5778f82202782afc3cbb9917f6692d3ef9","title":"A physical continuation inserts a semantic space · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":54.389,"exit_code":1,"observations":[{"actual":"abcd","check":"boundary 1","expected":"abcd","passed":true},{"actual":"ab","check":"boundary 2","expected":"a\nb","passed":false},{"actual":"ab","check":"boundary 3","expected":"a\\b","passed":false},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"abcd\", \"expected\": \"abcd\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"ab\", \"expected\": \"a\\nb\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"ab\", \"expected\": \"a\\\\b\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":54.151,"exit_code":1,"observations":[{"actual":"ab cd","check":"boundary 1","expected":"abcd","passed":false},{"actual":"a\nb","check":"boundary 2","expected":"a\nb","passed":true},{"actual":"a\\b","check":"boundary 3","expected":"a\\b","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"ab cd\", \"expected\": \"abcd\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"a\\nb\", \"expected\": \"a\\nb\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\\\\b\", \"expected\": \"a\\\\b\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":129.458,"exit_code":0,"observations":[{"actual":"abcd","check":"boundary 1","expected":"abcd","passed":true},{"actual":"a\nb","check":"boundary 2","expected":"a\nb","passed":true},{"actual":"a\\b","check":"boundary 3","expected":"a\\b","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"abcd\", \"expected\": \"abcd\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"a\\nb\", \"expected\": \"a\\nb\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\\\\b\", \"expected\": \"a\\\\b\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}