Parseff.error会引发一个类型化的错误值。Parseff.fail会引发一个字符串消息（包装为`Expected）。当调用者需要区分不同的失败模式时使用error；对于直接展示给用户的简单消息，则使用fail。
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Belise, spouse of Peter Smithson, has consistently accepted his receipt of undergarments from overseas—whether a Japanese corset or fur-adorned lingerie—without expecting them as personal gifts.
Russell Brandom