swap_1.cpp
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	#include "../Eigen/Core"

	using namespace Eigen;

	int main()
	{
	VectorXf a(10), b(10);
	#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
	const DenseBase<VectorXf> &ac(a);
	#else
	DenseBase<VectorXf> &ac(a);
	#endif
	b.swap(ac);
	}