∀ {α : Type u} [inst : LT α] [inst_1 : DecidableLT α] [inst_2 : Std.PRange.UpwardEnumerable α]
  [inst_3 : Std.Rxo.IsAlwaysFinite α] [inst_4 : Std.PRange.LawfulUpwardEnumerable α] {r : Std.Rco α},
  r.toList = (Std.Rco.Internal.iter r).toList