{α : Type u} →
  {β : Type v} →
    {cmp : autoParam (α → α → Ordering) Std.TreeMap._auto_1} →
      {P : Sort u_1} →
        {inner inner' : Std.DTreeMap α (fun x => β) cmp} →
          { inner := inner } = { inner := inner' } → (inner ≍ inner' → P) → P