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#include "../Eigen/Sparse"
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
#define CV_QUALIFIER const
#else
#define CV_QUALIFIER
#endif
using namespace Eigen;
void call_ref(Ref<SparseMatrix<float> > a) { }
int main()
{
SparseMatrix<float> a(10,10);
CV_QUALIFIER SparseMatrix<float>& ac(a);
call_ref(ac);
}