From 9ceaa8e445524e9f63720fa5015fa06f6dbdcb0e 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

---
 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 bc641aef4..8b58b512b 100644
--- a/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
+++ b/unsupported/Eigen/src/AutoDiff/AutoDiffScalar.h
@@ -629,7 +629,7 @@ template<typename DerType> struct NumTraits<AutoDiffScalar<DerType> >
   typedef AutoDiffScalar<Matrix<typename NumTraits<typename DerType::Scalar>::Real,DerType::RowsAtCompileTime,DerType::ColsAtCompileTime,
                                 DerType::Options, DerType::MaxRowsAtCompileTime, DerType::MaxColsAtCompileTime> > Real;
   typedef AutoDiffScalar<DerType> NonInteger;
-  typedef AutoDiffScalar<DerType>& Nested;
+  typedef AutoDiffScalar<DerType> Nested;
   enum{
     RequireInitialization = 1
   };