这可让您在巢状型别的成员定义中使用封入型别的型别参数。
This allows the type parameters of enclosing types to be used in the member definitions of a nested type.
您可以使用两种方式将常值强制为特定的资料型别：一是附加型别字元，另一则是将它放在封入字元中。
You can coerce a literal to a particular data type in two ways: by appending a type character to it, or by placing it within enclosing characters.
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