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// { dg-do compile }

// Origin: Alexandre Tolmos 

// PR c++/11876: Friend of its own class diagnostics

template 

class A

{

        friend class A;

        friend class A;

protected:

        T _data;

        inline A() : _data(0) {}

        template 

        inline A(const A& r) : _data(r._data) {}

};

class B : public A

{

public:

        inline B() {}

        inline B(const B& r) : A(r) {}

};

class C : public A

{

public:

        inline C() {}

        inline C(const B& r) : A(r) {}

};

int main(int, char*[])

{

        B b1, b2(b1);

        C c(b1);

        return 0;

}