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      1 #include "../Eigen/Sparse"
      2 
      3 using namespace Eigen;
      4 
      5 void call_ref(Ref<SparseMatrix<float> > a) { }
      6 
      7 int main()
      8 {
      9   SparseMatrix<float> a(10,10);
     10   SparseMatrixBase<SparseMatrix<float> > &ac(a);
     11 #ifdef EIGEN_SHOULD_FAIL_TO_BUILD
     12   call_ref(ac);
     13 #else
     14   call_ref(ac.derived());
     15 #endif
     16 }
     17