From efd484546e5482f83fb26187f88b99d8d7eca295 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 5 Nov 2015 13:54:26 +0100
Subject: [PATCH] bug #1063: nest AutoDiffScalar by value to avoid dead
 references (grafted from 971cfbb480614229b5f48b040ef9d5dd18a4ab44)

---
 unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
index 8d42e69b9..fde3ff61a 100644
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
@@ -631,7 +631,7 @@ template<typename DerType> struct NumTraits<AutoDiffScalar<DerType> >
 {
   typedef AutoDiffScalar<Matrix<typename NumTraits<typename DerType::Scalar>::Real,DerType::RowsAtCompileTime,DerType::ColsAtCompileTime> > Real;
   typedef AutoDiffScalar<DerType> NonInteger;
-  typedef AutoDiffScalar<DerType>& Nested;
+  typedef AutoDiffScalar<DerType> Nested;
   enum{
     RequireInitialization = 1
   };