(motive : Option (Lean.Elab.Do.MonadInfo × Lean.Expr) → Sort u_1) →
  (__do_lift : Option (Lean.Elab.Do.MonadInfo × Lean.Expr)) →
    ((r : Lean.Elab.Do.MonadInfo × Lean.Expr) → motive (some r)) → (Unit → motive none) → motive __do_lift