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