message: In class DeviceTensor, use '= default' for both, the copy
  constructor and the copy assignment.
diff: @@ -100,19 +100,11 @@ public:
  data = (capacity > 0) ? data_ : NULL;
  }
  - /// Copy constructor
  - MFEM_HOST_DEVICE DeviceTensor(const DeviceTensor& t)
  - {
  - capacity = t.capacity;
  - for (int i = 0; i < Dim; ++i)
  - {
  - sizes[i] = t.sizes[i];
  - }
  - data = t.data;
  - }
  + /// Copy constructor (default)
  + MFEM_HOST_DEVICE DeviceTensor(const DeviceTensor& t) = default;
  - /// Copy assignment not supported
  - MFEM_HOST_DEVICE DeviceTensor& operator=(DeviceTensor&) = delete;
  + /// Copy assignment (default)
  + MFEM_HOST_DEVICE DeviceTensor& operator=(const DeviceTensor&) = default;
  /// Conversion to `Scalar *`.
  MFEM_HOST_DEVICE inline operator Scalar *() const { return data; }
  