∀ {α : Type u} {r : Std.Rcc α} [inst : LE α] [inst_1 : DecidableLE α] [inst_2 : Std.PRange.UpwardEnumerable α]
  [inst_3 : Std.PRange.LawfulUpwardEnumerable α] [Std.PRange.LawfulUpwardEnumerableLE α]
  [inst_5 : Std.Rxc.IsAlwaysFinite α],
  r.toList = if r.lower ≤ r.upper then r.lower :: (r.lower<...=r.upper).toList else []