{α : Type u} →
  [inst : BEq α] →
    [inst_1 : Hashable α] →
      {motive : Lean.PersistentHashSet α → Sort u_1} →
        (t : Lean.PersistentHashSet α) → ((set : Lean.PersistentHashMap α Unit) → motive { set := set }) → motive t