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// { dg-do compile { target c++17 } } template <class T> struct A { A(T&); A(const A&); }; int i; A a = i; A a2 = a; template <class,class> struct same; template <class T> struct same<T,T> {}; same<decltype(a),A<int>> s1; same<decltype(a2),A<int>> s2;