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diff --git a/third_party/eigen3/Eigen/src/Eigen2Support/Block.h b/third_party/eigen3/Eigen/src/Eigen2Support/Block.h
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_BLOCK2_H
+#define EIGEN_BLOCK2_H
+
+namespace Eigen { 
+
+/** \returns a dynamic-size expression of a corner of *this.
+  *
+  * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
+  * \a Eigen::BottomLeft, \a Eigen::BottomRight.
+  * \param cRows the number of rows in the corner
+  * \param cCols the number of columns in the corner
+  *
+  * Example: \include MatrixBase_corner_enum_int_int.cpp
+  * Output: \verbinclude MatrixBase_corner_enum_int_int.out
+  *
+  * \note Even though the returned expression has dynamic size, in the case
+  * when it is applied to a fixed-size matrix, it inherits a fixed maximal size,
+  * which means that evaluating it does not cause a dynamic memory allocation.
+  *
+  * \sa class Block, block(Index,Index,Index,Index)
+  */
+template<typename Derived>
+inline Block<Derived> DenseBase<Derived>
+  ::corner(CornerType type, Index cRows, Index cCols)
+{
+  switch(type)
+  {
+    default:
+      eigen_assert(false && "Bad corner type.");
+    case TopLeft:
+      return Block<Derived>(derived(), 0, 0, cRows, cCols);
+    case TopRight:
+      return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
+    case BottomLeft:
+      return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
+    case BottomRight:
+      return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
+  }
+}
+
+/** This is the const version of corner(CornerType, Index, Index).*/
+template<typename Derived>
+inline const Block<Derived>
+DenseBase<Derived>::corner(CornerType type, Index cRows, Index cCols) const
+{
+  switch(type)
+  {
+    default:
+      eigen_assert(false && "Bad corner type.");
+    case TopLeft:
+      return Block<Derived>(derived(), 0, 0, cRows, cCols);
+    case TopRight:
+      return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
+    case BottomLeft:
+      return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
+    case BottomRight:
+      return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
+  }
+}
+
+/** \returns a fixed-size expression of a corner of *this.
+  *
+  * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
+  * \a Eigen::BottomLeft, \a Eigen::BottomRight.
+  *
+  * The template parameters CRows and CCols arethe number of rows and columns in the corner.
+  *
+  * Example: \include MatrixBase_template_int_int_corner_enum.cpp
+  * Output: \verbinclude MatrixBase_template_int_int_corner_enum.out
+  *
+  * \sa class Block, block(Index,Index,Index,Index)
+  */
+template<typename Derived>
+template<int CRows, int CCols>
+inline Block<Derived, CRows, CCols>
+DenseBase<Derived>::corner(CornerType type)
+{
+  switch(type)
+  {
+    default:
+      eigen_assert(false && "Bad corner type.");
+    case TopLeft:
+      return Block<Derived, CRows, CCols>(derived(), 0, 0);
+    case TopRight:
+      return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
+    case BottomLeft:
+      return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
+    case BottomRight:
+      return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
+  }
+}
+
+/** This is the const version of corner<int, int>(CornerType).*/
+template<typename Derived>
+template<int CRows, int CCols>
+inline const Block<Derived, CRows, CCols>
+DenseBase<Derived>::corner(CornerType type) const
+{
+  switch(type)
+  {
+    default:
+      eigen_assert(false && "Bad corner type.");
+    case TopLeft:
+      return Block<Derived, CRows, CCols>(derived(), 0, 0);
+    case TopRight:
+      return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
+    case BottomLeft:
+      return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
+    case BottomRight:
+      return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
+  }
+}
+
+} // end namespace Eigen
+
+#endif // EIGEN_BLOCK2_H