(motive : Option (Lean.NameSet × Lean.Expr) → Sort u_1) →
  (__discr : Option (Lean.NameSet × Lean.Expr)) →
    ((fst : Lean.NameSet) → (val : Lean.Expr) → motive (some (fst, val))) →
      ((x : Option (Lean.NameSet × Lean.Expr)) → motive x) → motive __discr