Method operator<<

Bcore/src/main/cpp/Dobby/tests/catch.hpp:6155–6158

  }

  friend auto operator<<(std::ostream &os, Parser const &parser) -> std::ostream & {
    parser.writeToStream(os);
    return os;
  }

  auto validate() const -> Result override {
    for (auto const &opt : m_options) {