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#include "../Eigen/Core"
using namespace Eigen;
#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
void call_ref(Ref<VectorXf> a) { }
#else
void call_ref(const Ref<const VectorXf> &a) { }
#endif
int main()
{
VectorXf a(10);
call_ref(a+a);
}
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