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Y template delcaration already exists, so line 2 is valid...any inputs?

since my assumption got wrong here, which one do you think is valid friend declaration? pls help me.

here line 1 already has forward declaration. So I could say friend declaration in line 2 is valid. Any suggestions?

which is a valid friend declaration for class template given below. I guess line 2 is valid...any suggestions?




template<class T> class Y {};
template<class T> class X{

friend class T; ...