(motive : Option Lean.DelayedMetavarAssignment → Sort u_1) →
  (__do_lift : Option Lean.DelayedMetavarAssignment) →
    ((d : Lean.DelayedMetavarAssignment) → motive (some d)) →
      ((x : Option Lean.DelayedMetavarAssignment) → motive x) → motive __do_lift