(motive : Id (Unit × Lean.Meta.Grind.Action.CollectState✝) → Sort u_1) →
  (x : Id (Unit × Lean.Meta.Grind.Action.CollectState✝¹)) →
    ((fst : Unit) → (s : Lean.Meta.Grind.Action.CollectState✝²) → motive (fst, s)) → motive x