initial commit

third_party/eigen/failtest/sparse_ref_5.cpp

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+#include "../Eigen/Sparse"
+
+using namespace Eigen;
+
+void call_ref(Ref<SparseMatrix<float> > a) {}
+
+int main() {
+  SparseMatrix<float> a(10, 10);
+  SparseMatrixBase<SparseMatrix<float> > &ac(a);
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+  call_ref(ac);
+#else
+  call_ref(ac.derived());
+#endif
+}