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// { dg-do compile { target c++17_only } }
// { dg-options "-fconcepts" }
template<typename T>
concept bool C = __is_class(T);
struct X { };
template<typename T>
struct Base {
Base(double) requires C<T> { }
};
struct Ok1 : Base<X> {
using Base<X>::Base;
};
struct Err1 : Base<int> {
using Base<int>::Base;
};
template<typename T>
struct Generic : Base<T> {
using Base<T>::Base;
};
int main() {
Ok1 x1(0.0);
Err1 x2(0.0); // { dg-error "no matching" }
Generic<X> x3(0.0);
Generic<int> x4(0.0); // { dg-error "no matching" }
}
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