∀ {α : Type u_1} [inst : LE α] [inst_1 : DecidableLE α] [inst_2 : Std.PRange.UpwardEnumerable α]
  [inst_3 : Std.PRange.LawfulUpwardEnumerableLE α] [Std.Rxc.IsAlwaysFinite α]
  [inst_5 : Std.PRange.LawfulUpwardEnumerable α] [inst_6 : Std.Rxc.HasSize α] [Std.Rxc.LawfulHasSize α] {r : Std.Roc α},
  r.iter.length = r.size