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  1. #include "../Eigen/Core"
  2. using namespace Eigen;
  3. int main(int argc,char **)
  4. {
  5. VectorXf a(10), b(10);
  6. #ifdef EIGEN_SHOULD_FAIL_TO_BUILD
  7. b = argc>1 ? 2*a : -a;
  8. #else
  9. b = argc>1 ? 2*a : VectorXf(-a);
  10. #endif
  11. }