{α : Type} →
  Lean.Meta.RefinedDiscrTree.TrieIndex →
    Lean.Meta.RefinedDiscrTree.PartialMatch✝ →
      Array Lean.Meta.RefinedDiscrTree.PartialMatch✝¹ →
        optParam ℕ 1 → Lean.Meta.RefinedDiscrTree.TreeM✝ α (Array Lean.Meta.RefinedDiscrTree.PartialMatch✝²)