{α : Type u_2} →
  {β : α → Type u_1} →
    (a : α) →
      (motive : Option (β a) × Std.DHashMap.Internal.Raw₀ α β → Sort u_3) →
        (x : Option (β a) × Std.DHashMap.Internal.Raw₀ α β) →
          ((previous : Option (β a)) →
              (r : Std.DHashMap.Raw α β) → (property : 0 < r.buckets.size) → motive (previous, ⟨r, property⟩)) →
            motive x