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

	#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
	#define CV_QUALIFIER const
	#else
	#define CV_QUALIFIER
	#endif

	using namespace Eigen;

	void foo(CV_QUALIFIER Matrix3d &m){
	Diagonal<Matrix3d> b(m.diagonal());
	}

	int main() {}