Fix lazy evaluation in Ref

Eigen/src/Core/Ref.h

@@ -239,7 +239,11 @@ template<typename TPlainObjectType, int Options, typename StrideType> class Ref<
     template<typename Expression>
     void construct(const Expression& expr, internal::false_type)
     {
+#ifdef EIGEN_TEST_EVALUATORS
+      internal::call_assignment_no_alias(m_object,expr,internal::assign_op<Scalar>());
+#else
       m_object.lazyAssign(expr);
+#endif
       Base::construct(m_object);
     }