∀ {n : ℕ} {α : Type u} [inst : Std.PRange.UpwardEnumerable α] [inst_1 : Std.PRange.LawfulUpwardEnumerable α]
  [inst_2 : Std.PRange.InfinitelyUpwardEnumerable α] {a : α},
  Std.PRange.succMany n (Std.PRange.succ a) = Std.PRange.succ (Std.PRange.succMany n a)