def merge(self, translations):
        if isinstance(translations, gettext.GNUTranslations):
            self._catalog.update(translations._catalog)
            if isinstance(translations, Translations):
                self.files.extend(translations.files)

        return self
Following a chain of Explorers.
dataset/ETHPy150Open ibagrak/algae/gae/libs/babel/support.py/Translations.merge--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/test/test_explorer.py/BrowserTests.test_chain