(motive : Option (Array (Lean.TSyntax `Lean.Parser.Term.attrInstance)) → Sort u_1) →
  (x : Option (Array (Lean.TSyntax `Lean.Parser.Term.attrInstance))) →
    ((stxs : Array (Lean.TSyntax `Lean.Parser.Term.attrInstance)) → motive (some stxs)) →
      (Unit → motive none) → motive x