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// { dg-do compile { target c++20 } }
template<typename T>
concept check_c = false;
template<typename T>
concept c1 = requires (T x) {
requires check_c<decltype(x)>;
};
template<c1 T>
void f1() { }
template<typename T>
void f2(T x) requires requires { requires check_c<decltype(x)>; } { }
template<typename T>
constexpr bool check_f() { return false; }
template<typename T>
concept c2 = requires (T x) {
requires check_f<decltype(x)>();
};
template<c2 T>
void f3() { }
template<typename T>
void f4(T x) requires requires { requires check_f<decltype(x)>(); } { }
template<typename T>
constexpr bool check_v = false;
template<typename T>
concept c3 = requires (T x) {
requires check_v<decltype(x)>;
};
template<c3 T>
void f5() { }
template<typename T>
void f6(T x) requires requires { requires check_v<decltype(x)>; } { }
void test()
{
f1<int>(); // { dg-error "no match" }
f2(0); // { dg-error "no match" }
f3<int>(); // { dg-error "no match" }
f4(0); // { dg-error "no match" }
f5<int>(); // { dg-error "no match" }
f6(0); // { dg-error "no match" }
}
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