{α : Type u_1} →
  {β : α → Type u_2} →
    (motive : Std.DTreeMap.Internal.Impl α β → Sort u_3) →
      (x : Std.DTreeMap.Internal.Impl α β) →
        (Unit → motive Std.DTreeMap.Internal.Impl.leaf) →
          ((size : ℕ) →
              (k : α) →
                (v : β k) →
                  (l r : Std.DTreeMap.Internal.Impl α β) → motive (Std.DTreeMap.Internal.Impl.inner size k v l r)) →
            motive x