1#include "../Eigen/Core"
2
3#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
4#define CV_QUALIFIER const
5#else
6#define CV_QUALIFIER
7#endif
8
9using namespace Eigen;
10
11void foo(CV_QUALIFIER Matrix3d &m){
12    Block<Matrix3d,3,3> b(m.block<3,3>(0,0));
13}
14
15int main() {}
16