1 // { dg-options "-std=c++17 -fconcepts" }
6 concept bool C() { return __is_class(T); }
9 concept bool D() { return C<T>() && __is_empty(T); }
12 struct Y { int n; } y;
18 void f() requires C<T>();
21 template<> void S<int>::f() { called = 1; } // { dg-error "match" }