message: fix for deprecated operator
diff: @@ -181,7 +181,7 @@ void test_derefine_L2_element(int order, Element::Type el_type, int basis_type)
  // deep copy the fine solution
  Vector xf = x;
  GridFunction x_fine(x.FESpace());
  - x_fine.SetData(xf);
  + x_fine.SetData(xf.GetData());
  double mass_fine = integrate(&x_fine);
  