(motive : Option Lean.Grind.CommRing.Var → Sort u_1) →
  (x : Option Lean.Grind.CommRing.Var) →
    ((x : Lean.Grind.CommRing.Var) → motive (some x)) → ((x : Option Lean.Grind.CommRing.Var) → motive x) → motive x