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// { dg-options "-std=c++17 -fconcepts" }
template<typename T, typename U>
struct is_same
{
static constexpr bool value = false;
};
template<typename T>
struct is_same<T, T>
{
static constexpr bool value = true;
};
template<class T, class U>
concept bool Same = is_same<T, U>::value;
template<typename T>
concept bool C1 = true;
template<typename T, typename U>
concept bool C2 = true;
template<typename T>
concept bool C3() { return true; }
template<typename T, typename U>
concept bool C4() { return true; }
C1 c1 = 0;
C2<int> c2 = 0;
C3 c3 = 0;
C4<int> c4 = 0;
Same<int> s1 = 'a'; // { dg-error "does not satisfy|is_same" }
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