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      1 #include "../Eigen/Core"
      2 
      3 using namespace Eigen;
      4 
      5 int main()
      6 {
      7   VectorXf a(10), b(10);
      8   VectorXf const &ac(a);
      9 #ifdef EIGEN_SHOULD_FAIL_TO_BUILD
     10   b.swap(ac);
     11 #else
     12   b.swap(ac.const_cast_derived());
     13 #endif
     14 }