这种情况的原因在于，编译器在编译时仅知道t是引用类型，因此必须使用对所有引用类型都有效的默认运算符。

The reason for this behavior is that, at compile time, the compiler only knows that t is a reference type, and therefore must use the default operators that are valid for all reference types.

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不能在相等运算符的重载实现中使用默认相等运算符。

You cannot use the default equality operator in an overloaded implementation of the equality operator.

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不能在相等运算符的重载实现中使用默认相等运算符。

You cannot use the default equality operator in an overloaded implementation of the equality operator.

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