{α : Type u} →
  {β : Type v} →
    {cmp : α → α → Ordering} →
      {P : Sort u_1} →
        {a : Option β} →
          {a_1 : Std.TreeMap.Raw α (Lean.PrefixTreeNode α β cmp) cmp} →
            {a' : Option β} →
              {a'_1 : Std.TreeMap.Raw α (Lean.PrefixTreeNode α β cmp) cmp} →
                Lean.PrefixTreeNode.Node a a_1 = Lean.PrefixTreeNode.Node a' a'_1 → (a ≍ a' → a_1 ≍ a'_1 → P) → P