Method isOptionTy

include/ast/component/type.h:301–303

    return std::holds_alternative<EnumTy>(Type);
  }
  bool isOptionTy() const noexcept {
    return std::holds_alternative<OptionTy>(Type);
  }
  bool isResultTy() const noexcept {
    return std::holds_alternative<ResultTy>(Type);
  }