E2515 Cannot explicitly specialize a member of a generic template class (C++)

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You are trying to make a generic template into a specialized member. For example, the following code is illegal:

     template<typename >
 class foo {
 template<typename>
       class bar {
       };
     };
 template<typename >
 template<>
 class foo<T>::bar<char> {
 };

The second declaration in the example is an error, because it tries to explicitly specialize bar<char> within foo<T>.