The enclosing type is then itself abstract.

包含它的类型于是也是一个抽象类型。

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Referring to enclosing type parameters inside static methods and static inner classes is prohibited outright by the compiler. So, for instance, the following code is illegal in tiger.

编译器完全禁止在静态方法和静态内部类中引用封闭类型参数。

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Properties, fields, and constructors cannot be more generic than the enclosing type.

属性、字段和构造函数不能比封闭类型更具一般性。

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