message: Another attempt for AppVeyor.
diff: @@ -258,7 +258,7 @@ int ElementRestriction::FillI(SparseMatrix &mat) const
  const int all_dofs = ndofs;
  const int vd = vdim;
  const int elt_dofs = dof;
  - auto I = mat.WriteI();
  + auto I = mat.ReadWriteI();
  auto d_offsets = offsets.Read();
  auto d_indices = indices.Read();
  auto d_gatherMap = gatherMap.Read();
  @@ -480,7 +480,7 @@ void L2ElementRestriction::FillI(SparseMatrix &mat) const
  {
  const int elem_dofs = ndof;
  const int vd = vdim;
  - auto I = mat.ReadWriteI();
  + auto I = mat.WriteI();
  MFEM_FORALL(dof, ne*elem_dofs*vd,
  {
  I[dof] = elem_dofs;
  