{"abstract":"Inserted message arguments are parsed again.","category":"Localization message semantics","checks":8,"contract":"Replace placeholders whose names consist of one or more lowercase ASCII letters, enclosed in braces, found in the original template exactly once. Inserted values are opaque strings and missing names retain their original placeholder.","evaluation_group":"model-fd3c343bb06bdc77","failed_approach":"Reversing substitution order merely changes which inserted value is reparsed.","family":"z-localization-opaque-arguments","id":"FA-11776","implementations":{"attempt":{"sha256":"e9a015008618ecc8b4665892a52a8b58eb9caf35ed873de30b7369b25e8949a3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re\nN = 1\nobservations = []\ndef solve(template, values):\n    for key,value in reversed(list(values.items())): template = template.replace('{'+key+'}',value)\n    return template\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('uppercase literal', solve('{User}',{'User':'Alice'}), '{User}')\ncheck('underscore literal', solve('{user_name}',{'user_name':'Alice'}), '{user_name}')\ncheck('forward cascade', solve('{a}',{'a':'{b}','b':'B'}), '{b}')\ncheck('reverse cascade', solve('{b}',{'a':'A','b':'{a}'}), '{a}')\ncheck('repeat', solve('{a}/{a}',{'a':str(N)}), str(N)+'/'+str(N))\ncheck('missing', solve('{missing}',{}), '{missing}')\ncheck('literal', solve('plain',{'a':'x'}), 'plain')\ncheck('mixed', solve('{a}-{b}',{'a':'{b}','b':'B'}), '{b}-B')\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":"216f6c4a36849ceba95269d52b31cc6786bbfd31773d1942e185be6461ad95c3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re\nN = 1\nobservations = []\ndef solve(template, values):\n    for key,value in values.items(): template = template.replace('{'+key+'}',value)\n    return template\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('uppercase literal', solve('{User}',{'User':'Alice'}), '{User}')\ncheck('underscore literal', solve('{user_name}',{'user_name':'Alice'}), '{user_name}')\ncheck('forward cascade', solve('{a}',{'a':'{b}','b':'B'}), '{b}')\ncheck('reverse cascade', solve('{b}',{'a':'A','b':'{a}'}), '{a}')\ncheck('repeat', solve('{a}/{a}',{'a':str(N)}), str(N)+'/'+str(N))\ncheck('missing', solve('{missing}',{}), '{missing}')\ncheck('literal', solve('plain',{'a':'x'}), 'plain')\ncheck('mixed', solve('{a}-{b}',{'a':'{b}','b':'B'}), '{b}-B')\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":"b17e2851f305d2f3856a5eed474c32249ce0ea3db69f643cccdb96e293ecb546","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re\nN = 1\nobservations = []\ndef solve(template, values):\n    return re.sub(r'\\{([a-z]+)\\}',lambda m: values.get(m.group(1),m.group(0)),template)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('uppercase literal', solve('{User}',{'User':'Alice'}), '{User}')\ncheck('underscore literal', solve('{user_name}',{'user_name':'Alice'}), '{user_name}')\ncheck('forward cascade', solve('{a}',{'a':'{b}','b':'B'}), '{b}')\ncheck('reverse cascade', solve('{b}',{'a':'A','b':'{a}'}), '{a}')\ncheck('repeat', solve('{a}/{a}',{'a':str(N)}), str(N)+'/'+str(N))\ncheck('missing', solve('{missing}',{}), '{missing}')\ncheck('literal', solve('plain',{'a':'x'}), 'plain')\ncheck('mixed', solve('{a}-{b}',{'a':'{b}','b':'B'}), '{b}-B')\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":"Only the explicitly specified miniature locale/message rules are modeled. 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":"z-localization-opaque-arguments","generated_at":"2026-09-29T14:38:50.927359+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This offline controlled message model isolates a localization decision; it does not implement a complete message-format or locale standard.","repair":"Replace placeholders whose names consist of one or more lowercase ASCII letters, enclosed in braces, found in the original template exactly once. Inserted values are opaque strings and missing names retain their original placeholder.","root_cause":"Sequential substitutions interpret placeholders embedded in a previously inserted user value.","sha256":"831e3c2d1acb1e45c42be5c11985d7b45cb789a9926d73eeb6e8c7a03f7e2d0a","title":"Inserted message arguments are parsed again · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.31,"exit_code":1,"observations":[{"actual":"Alice","check":"uppercase literal","expected":"{User}","passed":false},{"actual":"Alice","check":"underscore literal","expected":"{user_name}","passed":false},{"actual":"{b}","check":"forward cascade","expected":"{b}","passed":true},{"actual":"A","check":"reverse cascade","expected":"{a}","passed":false},{"actual":"1/1","check":"repeat","expected":"1/1","passed":true},{"actual":"{missing}","check":"missing","expected":"{missing}","passed":true},{"actual":"plain","check":"literal","expected":"plain","passed":true},{"actual":"{b}-B","check":"mixed","expected":"{b}-B","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"uppercase literal\", \"actual\": \"Alice\", \"expected\": \"{User}\", \"passed\": false}, {\"check\": \"underscore literal\", \"actual\": \"Alice\", \"expected\": \"{user_name}\", \"passed\": false}, {\"check\": \"forward cascade\", \"actual\": \"{b}\", \"expected\": \"{b}\", \"passed\": true}, {\"check\": \"reverse cascade\", \"actual\": \"A\", \"expected\": \"{a}\", \"passed\": false}, {\"check\": \"repeat\", \"actual\": \"1/1\", \"expected\": \"1/1\", \"passed\": true}, {\"check\": \"missing\", \"actual\": \"{missing}\", \"expected\": \"{missing}\", \"passed\": true}, {\"check\": \"literal\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}, {\"check\": \"mixed\", \"actual\": \"{b}-B\", \"expected\": \"{b}-B\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.221,"exit_code":1,"observations":[{"actual":"Alice","check":"uppercase literal","expected":"{User}","passed":false},{"actual":"Alice","check":"underscore literal","expected":"{user_name}","passed":false},{"actual":"B","check":"forward cascade","expected":"{b}","passed":false},{"actual":"{a}","check":"reverse cascade","expected":"{a}","passed":true},{"actual":"1/1","check":"repeat","expected":"1/1","passed":true},{"actual":"{missing}","check":"missing","expected":"{missing}","passed":true},{"actual":"plain","check":"literal","expected":"plain","passed":true},{"actual":"B-B","check":"mixed","expected":"{b}-B","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"uppercase literal\", \"actual\": \"Alice\", \"expected\": \"{User}\", \"passed\": false}, {\"check\": \"underscore literal\", \"actual\": \"Alice\", \"expected\": \"{user_name}\", \"passed\": false}, {\"check\": \"forward cascade\", \"actual\": \"B\", \"expected\": \"{b}\", \"passed\": false}, {\"check\": \"reverse cascade\", \"actual\": \"{a}\", \"expected\": \"{a}\", \"passed\": true}, {\"check\": \"repeat\", \"actual\": \"1/1\", \"expected\": \"1/1\", \"passed\": true}, {\"check\": \"missing\", \"actual\": \"{missing}\", \"expected\": \"{missing}\", \"passed\": true}, {\"check\": \"literal\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}, {\"check\": \"mixed\", \"actual\": \"B-B\", \"expected\": \"{b}-B\", \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":38.985,"exit_code":0,"observations":[{"actual":"{User}","check":"uppercase literal","expected":"{User}","passed":true},{"actual":"{user_name}","check":"underscore literal","expected":"{user_name}","passed":true},{"actual":"{b}","check":"forward cascade","expected":"{b}","passed":true},{"actual":"{a}","check":"reverse cascade","expected":"{a}","passed":true},{"actual":"1/1","check":"repeat","expected":"1/1","passed":true},{"actual":"{missing}","check":"missing","expected":"{missing}","passed":true},{"actual":"plain","check":"literal","expected":"plain","passed":true},{"actual":"{b}-B","check":"mixed","expected":"{b}-B","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"uppercase literal\", \"actual\": \"{User}\", \"expected\": \"{User}\", \"passed\": true}, {\"check\": \"underscore literal\", \"actual\": \"{user_name}\", \"expected\": \"{user_name}\", \"passed\": true}, {\"check\": \"forward cascade\", \"actual\": \"{b}\", \"expected\": \"{b}\", \"passed\": true}, {\"check\": \"reverse cascade\", \"actual\": \"{a}\", \"expected\": \"{a}\", \"passed\": true}, {\"check\": \"repeat\", \"actual\": \"1/1\", \"expected\": \"1/1\", \"passed\": true}, {\"check\": \"missing\", \"actual\": \"{missing}\", \"expected\": \"{missing}\", \"passed\": true}, {\"check\": \"literal\", \"actual\": \"plain\", \"expected\": \"plain\", \"passed\": true}, {\"check\": \"mixed\", \"actual\": \"{b}-B\", \"expected\": \"{b}-B\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}