(motive : Option (Lean.MVarId × Lean.Meta.FVarSubst) → Sort u_1) →
  (__discr : Option (Lean.MVarId × Lean.Meta.FVarSubst)) →
    ((goal : Lean.MVarId) → (snd : Lean.Meta.FVarSubst) → motive (some (goal, snd))) →
      ((x : Option (Lean.MVarId × Lean.Meta.FVarSubst)) → motive x) → motive __discr