{α : Type u} →
  {β : α → Type v} →
    {motive : Std.DTreeMap.Internal.Impl.RawView α β → Sort u_1} →
      (t : Std.DTreeMap.Internal.Impl.RawView α β) →
        ((k : α) → (v : β k) → (tree : Std.DTreeMap.Internal.Impl α β) → motive { k := k, v := v, tree := tree }) →
          motive t