Get rid of include directives inside namespace blocks (bug #339).

Eigen/src/SparseCore/SparseView.h

@@ -26,6 +26,8 @@
 #ifndef EIGEN_SPARSEVIEW_H
 #define EIGEN_SPARSEVIEW_H
 
+namespace Eigen { 
+
 namespace internal {
 
 template<typename MatrixType>
@@ -106,4 +108,6 @@ const SparseView<Derived> MatrixBase<Derived>::sparseView(const Scalar& m_refere
   return SparseView<Derived>(derived(), m_reference, m_epsilon);
 }
 
+} // end namespace Eigen
+
 #endif