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// { dg-do compile { target c++17 } }
// { dg-options "-fconcepts" }
template <class T> concept bool Copyable = requires (T t) { T(t); };
template <class T> concept bool Constructable = requires { T(); };
template <class T> concept bool Both = Copyable<T> && Constructable<T>;
template <Copyable... Ts>
constexpr int f(Ts...) { return 0; } // #1
template <Both... Ts>
constexpr int f(Ts...) { return 1; } // #2
int main()
{
static_assert(f(42) == 1);
}
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