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// { dg-do run }
// { dg-options "-std=c++1z" }
#include <cassert>
// Check partial ordering during overload resolution.
template<typename T>
concept bool C() { return __is_class(T); }
template<typename T>
concept bool D() { return C<T>() and __is_empty(T); }
struct S1 { } s1;
struct S2 { int n; } s2;
int called = 0;
template<C T> void f1(T x) { called = 1;}
template<D T> void f1(T x) { called = 2;}
int main() {
f1(s1); assert(called == 2);
f1(s2); assert(called == 1);
}
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