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(){
12    MatrixXf m;
13    Block<CV_QUALIFIER MatrixXf, 3, 3>(m, 0, 0).coeffRef(0, 0) = 1.0f;
14}
15
16int main() {}
17