swap_2.cpp
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	#include "../Eigen/Core"

	using namespace Eigen;

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