Method hasGenerator

extlibs/catch/include/catch/catch.hpp:12073–12075

            // TrackerBase interface
            bool isGeneratorTracker() const override { return true; }
            auto hasGenerator() const -> bool override {
                return !!m_generator;
            }
            void close() override {
                TrackerBase::close();
                // Generator interface only finds out if it has another item on atual move