每当需要一个特殊类型时，该类型的初始化器就很明显地被提升成类型本身。

Whenever a particular type is required, the initializer for that type is transparently lifted into the type itself.

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新的auto语法：根据初始化器(initializer)表达式推导类型。

Welcome to the new auto syntax: type deduction from initializer expressions.

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如果初始化器是一个bytes literal，则无须指定编码类型：请记住，bytes literal并不是字符串。

If the initializer is a bytes literal, you need not specify the encoding type: Remember, bytes literals are not strings. But like strings, you can concatenate bytes.

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