gcc/testsuite/g++.dg/cpp2a/concepts-explicit-spec2.C


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// { dg-do compile { target c++20 } }

template<typename T>
  concept C = __is_class(T);

struct X { };

template<C T> struct S;
template<> struct S<X> { void f() { } };

int main() {
  S<X> x; x.f();
}