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// { dg-do compile { target c++2a } }
template<class From, class To>
concept convertible_to = requires(From (&f)(), void (&g)(To)) { g(f()); };
template<class T>
concept Addable =
requires(T x){
{x + x} -> convertible_to<T>;
};
int main(){
Addable auto t = 0;
}
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