(motive : Option Lean.Elab.PartialFixpointType → Sort u_1) →
  (x : Option Lean.Elab.PartialFixpointType) →
    ((res : Lean.Elab.PartialFixpointType) → motive (some res)) →
      ((x : Option Lean.Elab.PartialFixpointType) → motive x) → motive x