Static asserts to check for matching NumDimensions

unsupported/Eigen/CXX11/src/Tensor/Tensor.h

diff --git a/unsupported/Eigen/CXX11/src/Tensor/Tensor.h b/unsupported/Eigen/CXX11/src/Tensor/Tensor.h
index a24097a..e596147 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/Tensor.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/Tensor.h
@@ -299,6 +299,7 @@
     EIGEN_DEVICE_FUNC
     EIGEN_STRONG_INLINE Tensor(const TensorBase<OtherDerived, ReadOnlyAccessors>& other)
     {
+      EIGEN_STATIC_ASSERT(OtherDerived::NumDimensions == Base::NumDimensions, Number_of_dimensions_must_match)
       typedef TensorAssignOp<Tensor, const OtherDerived> Assign;
       Assign assign(*this, other.derived());
       resize(TensorEvaluator<const Assign, DefaultDevice>(assign, DefaultDevice()).dimensions());
@@ -309,6 +310,7 @@
     EIGEN_DEVICE_FUNC
     EIGEN_STRONG_INLINE Tensor(const TensorBase<OtherDerived, WriteAccessors>& other)
     {
+      EIGEN_STATIC_ASSERT(OtherDerived::NumDimensions == Base::NumDimensions, Number_of_dimensions_must_match)
       typedef TensorAssignOp<Tensor, const OtherDerived> Assign;
       Assign assign(*this, other.derived());
       resize(TensorEvaluator<const Assign, DefaultDevice>(assign, DefaultDevice()).dimensions());