diff --git a/Eigen/src/Array/Array.h b/Eigen/src/Array/Array.h
index fc8c500c2..2f155aeeb 100644
--- a/Eigen/src/Array/Array.h
+++ b/Eigen/src/Array/Array.h
@@ -189,11 +189,6 @@ class Array
       other.evalTo(*this);
     }
 
-//     template<typename OtherDerived>
-//     Array& lazyAssign(const ArrayBase<OtherDerived>& other);
-//     template<typename OtherDerived>
-//     Array& lazyAssign(const MatrixBase<OtherDerived>& other);
-
     /** \sa MatrixBase::operator=(const AnyMatrixBase<OtherDerived>&) */
     template<typename OtherDerived>
     EIGEN_STRONG_INLINE Array(const AnyMatrixBase<OtherDerived> &other)
diff --git a/Eigen/src/Array/Replicate.h b/Eigen/src/Array/Replicate.h
index b17c13aa6..5a9b10738 100644
--- a/Eigen/src/Array/Replicate.h
+++ b/Eigen/src/Array/Replicate.h
@@ -40,6 +40,7 @@
   */
 template<typename MatrixType,int RowFactor,int ColFactor>
 struct ei_traits<Replicate<MatrixType,RowFactor,ColFactor> >
+ : ei_traits<MatrixType>
 {
   typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_traits<MatrixType>::StorageType StorageType;
diff --git a/Eigen/src/Array/Reverse.h b/Eigen/src/Array/Reverse.h
index 44380eb48..a8d8310a9 100644
--- a/Eigen/src/Array/Reverse.h
+++ b/Eigen/src/Array/Reverse.h
@@ -43,6 +43,7 @@
   */
 template<typename MatrixType, int Direction>
 struct ei_traits<Reverse<MatrixType, Direction> >
+ : ei_traits<MatrixType>
 {
   typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_traits<MatrixType>::StorageType StorageType;
diff --git a/Eigen/src/Array/Select.h b/Eigen/src/Array/Select.h
index a776bf40a..1983bd870 100644
--- a/Eigen/src/Array/Select.h
+++ b/Eigen/src/Array/Select.h
@@ -43,6 +43,7 @@
 
 template<typename ConditionMatrixType, typename ThenMatrixType, typename ElseMatrixType>
 struct ei_traits<Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >
+ : ei_traits<ThenMatrixType>
 {
   typedef typename ei_traits<ThenMatrixType>::Scalar Scalar;
   typedef Dense StorageType;
diff --git a/Eigen/src/Array/VectorwiseOp.h b/Eigen/src/Array/VectorwiseOp.h
index a409d4dc6..f6774a019 100644
--- a/Eigen/src/Array/VectorwiseOp.h
+++ b/Eigen/src/Array/VectorwiseOp.h
@@ -48,6 +48,7 @@ class PartialReduxExpr;
 
 template<typename MatrixType, typename MemberOp, int Direction>
 struct ei_traits<PartialReduxExpr<MatrixType, MemberOp, Direction> >
+ : ei_traits<MatrixType>
 {
   typedef typename MemberOp::result_type Scalar;
   typedef typename ei_traits<MatrixType>::StorageType StorageType;
diff --git a/Eigen/src/Core/DenseStorageBase.h b/Eigen/src/Core/DenseStorageBase.h
index b9257156e..ed116d708 100644
--- a/Eigen/src/Core/DenseStorageBase.h
+++ b/Eigen/src/Core/DenseStorageBase.h
@@ -546,7 +546,7 @@ struct ei_conservative_resize_like_impl
     EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(Derived)
     EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(OtherDerived)
 
-    typename DenseBase<Derived>::PlainMatrixType tmp(other);
+    typename Derived::PlainMatrixType tmp(other);
     const int common_rows = std::min(tmp.rows(), _this.rows());
     const int common_cols = std::min(tmp.cols(), _this.cols());
     tmp.block(0,0,common_rows,common_cols) = _this.block(0,0,common_rows,common_cols);
@@ -562,7 +562,7 @@ struct ei_conservative_resize_like_impl<Derived,OtherDerived,true>
     if (_this.rows() == other.rows() && _this.cols() == other.cols()) return;
 
     // segment(...) will check whether Derived/OtherDerived are vectors!
-    typename DenseBase<Derived>::PlainMatrixType tmp(other);
+    typename Derived::PlainMatrixType tmp(other);
     const int common_size = std::min<int>(_this.size(),tmp.size());
     tmp.segment(0,common_size) = _this.segment(0,common_size);
     _this.derived().swap(tmp);
diff --git a/Eigen/src/Core/Diagonal.h b/Eigen/src/Core/Diagonal.h
index 25aa9cd4c..344dbca40 100644
--- a/Eigen/src/Core/Diagonal.h
+++ b/Eigen/src/Core/Diagonal.h
@@ -44,9 +44,8 @@
   */
 template<typename MatrixType, int Index>
 struct ei_traits<Diagonal<MatrixType,Index> >
+ : ei_traits<MatrixType>
 {
-  typedef typename MatrixType::Scalar Scalar;
-  typedef typename ei_traits<MatrixType>::StorageType StorageType;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
   enum {
diff --git a/Eigen/src/Core/DiagonalProduct.h b/Eigen/src/Core/DiagonalProduct.h
index 42e2e948d..87068d9ba 100644
--- a/Eigen/src/Core/DiagonalProduct.h
+++ b/Eigen/src/Core/DiagonalProduct.h
@@ -28,9 +28,9 @@
 
 template<typename MatrixType, typename DiagonalType, int ProductOrder>
 struct ei_traits<DiagonalProduct<MatrixType, DiagonalType, ProductOrder> >
+ : ei_traits<MatrixType>
 {
   typedef typename ei_scalar_product_traits<typename MatrixType::Scalar, typename DiagonalType::Scalar>::ReturnType Scalar;
-  typedef typename ei_traits<MatrixType>::StorageType StorageType;
   enum {
     RowsAtCompileTime = MatrixType::RowsAtCompileTime,
     ColsAtCompileTime = MatrixType::ColsAtCompileTime,
diff --git a/Eigen/src/Core/Minor.h b/Eigen/src/Core/Minor.h
index 1db60b002..3ed0fec6b 100644
--- a/Eigen/src/Core/Minor.h
+++ b/Eigen/src/Core/Minor.h
@@ -40,9 +40,8 @@
   */
 template<typename MatrixType>
 struct ei_traits<Minor<MatrixType> >
+ : ei_traits<MatrixType>
 {
-  typedef typename MatrixType::Scalar Scalar;
-  typedef typename ei_traits<MatrixType>::StorageType StorageType;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
   enum {
diff --git a/Eigen/src/Core/ProductBase.h b/Eigen/src/Core/ProductBase.h
index 2df864458..d835f16b7 100644
--- a/Eigen/src/Core/ProductBase.h
+++ b/Eigen/src/Core/ProductBase.h
@@ -29,7 +29,7 @@
   *
   */
 template<typename Derived, typename _Lhs, typename _Rhs>
-struct ei_traits<ProductBase<Derived,_Lhs,_Rhs> >
+struct ei_traits<ProductBase<Derived,_Lhs,_Rhs> > : ei_traits<typename ei_cleantype<_Lhs>::type>
 {
   typedef typename ei_cleantype<_Lhs>::type Lhs;
   typedef typename ei_cleantype<_Rhs>::type Rhs;
diff --git a/Eigen/src/Core/Transpose.h b/Eigen/src/Core/Transpose.h
index b202f62c4..513ce522a 100644
--- a/Eigen/src/Core/Transpose.h
+++ b/Eigen/src/Core/Transpose.h
@@ -38,7 +38,7 @@
   * \sa MatrixBase::transpose(), MatrixBase::adjoint()
   */
 template<typename MatrixType>
-struct ei_traits<Transpose<MatrixType> >
+struct ei_traits<Transpose<MatrixType> > : ei_traits<MatrixType>
 {
   typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
diff --git a/Eigen/src/Core/products/GeneralUnrolled.h b/Eigen/src/Core/products/GeneralUnrolled.h
index 72a61354e..7e2eebf08 100644
--- a/Eigen/src/Core/products/GeneralUnrolled.h
+++ b/Eigen/src/Core/products/GeneralUnrolled.h
@@ -45,6 +45,7 @@ struct ei_product_packet_impl;
 template<typename LhsNested, typename RhsNested>
 struct ei_traits<GeneralProduct<LhsNested,RhsNested,UnrolledProduct> >
 {
+  typedef DenseStorageMatrix DenseStorageType;
   typedef typename ei_cleantype<LhsNested>::type _LhsNested;
   typedef typename ei_cleantype<RhsNested>::type _RhsNested;
   typedef typename ei_scalar_product_traits<typename _LhsNested::Scalar, typename _RhsNested::Scalar>::ReturnType Scalar;
diff --git a/Eigen/src/Geometry/Homogeneous.h b/Eigen/src/Geometry/Homogeneous.h
index f64c92bc1..6cf6a381d 100644
--- a/Eigen/src/Geometry/Homogeneous.h
+++ b/Eigen/src/Geometry/Homogeneous.h
@@ -41,8 +41,8 @@
   */
 template<typename MatrixType,int Direction>
 struct ei_traits<Homogeneous<MatrixType,Direction> >
+ : ei_traits<MatrixType>
 {
-  typedef typename MatrixType::Scalar Scalar;
   typedef typename ei_traits<MatrixType>::StorageType StorageType;
   typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
   typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
diff --git a/Eigen/src/Sparse/SparseMatrixBase.h b/Eigen/src/Sparse/SparseMatrixBase.h
index b7ac6594a..4ea1023af 100644
--- a/Eigen/src/Sparse/SparseMatrixBase.h
+++ b/Eigen/src/Sparse/SparseMatrixBase.h
@@ -109,13 +109,7 @@ template<typename Derived> class SparseMatrixBase : public AnyMatrixBase<Derived
                         Transpose<Derived>
                      >::ret AdjointReturnType;
 
-//     typedef Matrix<typename ei_traits<Derived>::Scalar,
-//             ei_traits<Derived>::RowsAtCompileTime,
-//             ei_traits<Derived>::ColsAtCompileTime,
-//             AutoAlign | (ei_traits<Derived>::Flags&RowMajorBit ? RowMajor : ColMajor),
-//             ei_traits<Derived>::MaxRowsAtCompileTime,
-//             ei_traits<Derived>::MaxColsAtCompileTime
-//       > PlainMatrixType;
+    typedef SparseMatrix<Scalar, Flags&RowMajorBit ? RowMajor : ColMajor> PlainMatrixType;
 
     #define EIGEN_CURRENT_STORAGE_BASE_CLASS Eigen::SparseMatrixBase
     #include "../plugins/CommonCwiseUnaryOps.h"
@@ -376,6 +370,7 @@ template<typename Derived> class SparseMatrixBase : public AnyMatrixBase<Derived
     template<typename OtherDerived>
     Derived& operator*=(const SparseMatrixBase<OtherDerived>& other);
 
+    #ifdef EIGEN2_SUPPORT
     // deprecated
     template<typename OtherDerived>
     typename ei_plain_matrix_type_column_major<OtherDerived>::type
@@ -386,6 +381,7 @@ template<typename Derived> class SparseMatrixBase : public AnyMatrixBase<Derived
     void solveTriangularInPlace(MatrixBase<OtherDerived>& other) const;
 //     template<typename OtherDerived>
 //     void solveTriangularInPlace(SparseMatrixBase<OtherDerived>& other) const;
+    #endif // EIGEN2_SUPPORT
 
     template<int Mode>
     inline const SparseTriangularView<Derived, Mode> triangularView() const;
diff --git a/Eigen/src/Sparse/SparseProduct.h b/Eigen/src/Sparse/SparseProduct.h
index 2aaa8713c..08f6e3cac 100644
--- a/Eigen/src/Sparse/SparseProduct.h
+++ b/Eigen/src/Sparse/SparseProduct.h
@@ -52,6 +52,7 @@ struct SparseProductReturnType
 template<typename LhsNested, typename RhsNested>
 struct ei_traits<SparseProduct<LhsNested, RhsNested> >
 {
+  typedef DenseStorageMatrix DenseStorageType;
   // clean the nested types:
   typedef typename ei_cleantype<LhsNested>::type _LhsNested;
   typedef typename ei_cleantype<RhsNested>::type _RhsNested;
@@ -261,6 +262,7 @@ struct ei_traits<SparseTimeDenseProduct<Lhs,Rhs> >
  : ei_traits<ProductBase<SparseTimeDenseProduct<Lhs,Rhs>, Lhs, Rhs> >
 {
   typedef Dense StorageType;
+  typedef DenseStorageMatrix DenseStorageType;
 };
 
 template<typename Lhs, typename Rhs>
diff --git a/Eigen/src/Sparse/TriangularSolver.h b/Eigen/src/Sparse/TriangularSolver.h
index d24756ba1..5b761e6ad 100644
--- a/Eigen/src/Sparse/TriangularSolver.h
+++ b/Eigen/src/Sparse/TriangularSolver.h
@@ -302,6 +302,7 @@ void SparseTriangularView<ExpressionType,Mode>::solveInPlace(SparseMatrixBase<Ot
 //     other = otherCopy;
 }
 
+#ifdef EIGEN2_SUPPORT
 
 // deprecated stuff:
 
@@ -323,5 +324,6 @@ SparseMatrixBase<Derived>::solveTriangular(const MatrixBase<OtherDerived>& other
   derived().solveTriangularInPlace(res);
   return res;
 }
+#endif // EIGEN2_SUPPORT
 
 #endif // EIGEN_SPARSETRIANGULARSOLVER_H