∀ {α : Type u_1} [inst : Std.PRange.UpwardEnumerable α] [Std.PRange.LawfulUpwardEnumerable α] {n : ℕ} {a : α},
  ((Std.PRange.succ? a).bind fun x => Std.PRange.succMany? n x) = Std.PRange.succMany? (n + 1) a