// 1. try-catch 返回值
val result: String? = exceptions.tryCatch {
    tryBlock  { riskyCall()          }
    catchBlock{ e -> log(e.message)  }
    finally   { cleanup()            }
}

// 2. 主动抛异常
exceptions.throwException {
    setMessageAndClassName("参数非法", "java.lang.IllegalArgumentException")
}

// 3. 构造脚本层 Throwable 对象（不抛出）
val thr = exceptions.newThrowable {
    setThrowable(java.io.IOException("IO 错误"))
}