{α : Type u} →
  {inst : Ord α} →
    {P : Sort u_1} →
      {treeMap : Std.DTreeMap.Internal.Impl α fun x => Unit} →
        {range : Std.Rci α} →
          {treeMap' : Std.DTreeMap.Internal.Impl α fun x => Unit} →
            {range' : Std.Rci α} →
              { treeMap := treeMap, range := range } = { treeMap := treeMap', range := range' } →
                (treeMap ≍ treeMap' → range ≍ range' → P) → P