(motive : Option Mathlib.Tactic.Order.OrderType → Sort u_1) →
  (__discr : Option Mathlib.Tactic.Order.OrderType) →
    ((orderType : Mathlib.Tactic.Order.OrderType) → motive (some orderType)) →
      ((x : Option Mathlib.Tactic.Order.OrderType) → motive x) → motive __discr