ref_5.cpp
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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
	}