'Can not general copy constructor in class template be defaulted?

In the following program struct template A has a constructor from const A<int> &. For A<int> it should be copy-constructor, which can be defaulted:

template<typename T>
struct A {
    A() {}
    A(const A<int> &) = default;
};

int main() {
    A<int> a;
}

This program is accepted by Clang, but both GCC and MSVC reject it with the error:

 error C2610: 'A<T>::A(const A<int> &)': is not a special member function or comparison operator which can be defaulted
note: see reference to class template instantiation 'A<T>' being compiled

Demo: https://gcc.godbolt.org/z/Mn6nMbe1x

Which compiler is right here?

c++templateslanguage-lawyercopy-constructordefault-constructor


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