{"abstract":"A literal plus is not escaped in UTF-7.","category":"Encodings","checks":4,"contract":"Encode Unicode text as standard UTF-7 ASCII.","evaluation_group":"model-34ef328a98f39e03","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-utf7-plus-escape","id":"FA-3936","implementations":{"attempt":{"sha256":"a8d7d1f426d556f2c730da2f0f308ff23c2752076e2fe8fc3f02f3778ddc2f35","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('+','+-')\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('+'), '+-')\ncheck('boundary 2', solve('é'), '+AOk-')\ncheck('boundary 3', solve('a+b'), 'a+-b')\ncheck('boundary 4', solve('plain'), 'plain')\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":"1f887476598c2cf8eb575d381ee8d17d7442923da0f420da0022f899dca48a7c","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\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('+'), '+-')\ncheck('boundary 2', solve('é'), '+AOk-')\ncheck('boundary 3', solve('a+b'), 'a+-b')\ncheck('boundary 4', solve('plain'), 'plain')\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":"8d64b7074d662bb78c538bf058f3d0ee6449ed0e3836d8789d65d34982e54616","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.encode('utf-7').decode('ascii')\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('+'), '+-')\ncheck('boundary 2', solve('é'), '+AOk-')\ncheck('boundary 3', solve('a+b'), 'a+-b')\ncheck('boundary 4', solve('plain'), 'plain')\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-utf7-plus-escape","generated_at":"2026-09-29T14:37:33.272297+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: Encode Unicode text as standard UTF-7 ASCII.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Encode Unicode text as standard UTF-7 ASCII.","sha256":"031c7810aac7c36b71d4191bd58aabc235144fece403dbfc3d07e32afc941a59","title":"A literal plus is not escaped in UTF-7 · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":58.021,"exit_code":1,"observations":[{"actual":"+-","check":"boundary 1","expected":"+-","passed":true},{"actual":"é","check":"boundary 2","expected":"+AOk-","passed":false},{"actual":"a+-b","check":"boundary 3","expected":"a+-b","passed":true},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"+-\", \"expected\": \"+-\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"é\", \"expected\": \"+AOk-\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"a+-b\", \"expected\": \"a+-b\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":67.158,"exit_code":1,"observations":[{"actual":"+","check":"boundary 1","expected":"+-","passed":false},{"actual":"é","check":"boundary 2","expected":"+AOk-","passed":false},{"actual":"a+b","check":"boundary 3","expected":"a+-b","passed":false},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"+\", \"expected\": \"+-\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"é\", \"expected\": \"+AOk-\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"a+b\", \"expected\": \"a+-b\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":57.264,"exit_code":0,"observations":[{"actual":"+-","check":"boundary 1","expected":"+-","passed":true},{"actual":"+AOk-","check":"boundary 2","expected":"+AOk-","passed":true},{"actual":"a+-b","check":"boundary 3","expected":"a+-b","passed":true},{"actual":"plain","check":"boundary 4","expected":"plain","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"+-\", \"expected\": \"+-\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"+AOk-\", \"expected\": \"+AOk-\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a+-b\", \"expected\": \"a+-b\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}