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#include "../Eigen/Core"
using namespace Eigen;
void call_ref(Ref<VectorXf> a) { }
int main()
{
VectorXf a(10);
DenseBase<VectorXf> &ac(a);
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
call_ref(ac);
#else
call_ref(ac.derived());
#endif
}
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