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// { dg-options "-std=c++17 -fconcepts" }
template<typename T>
concept bool C() { return __is_class(T); }
template<typename T>
struct S1 {
S1(double) requires C<T>() { }
};
template<typename T>
struct S2 : S1<T> { // { dg-error "matching" }
using S1<T>::S1;
};
int main() {
S2<int> s; // { dg-error "deleted function" }
}
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