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