{α : Type u} →
  [inst : Ord α] →
    {motive : Std.DTreeMap.Internal.Unit.RccSliceData α → Sort u_1} →
      (t : Std.DTreeMap.Internal.Unit.RccSliceData α) →
        ((treeMap : Std.DTreeMap.Internal.Impl α fun x => Unit) →
            (range : Std.Rcc α) → motive { treeMap := treeMap, range := range }) →
          motive t