code: def merge_directories(self, directory_digests):
      
      result = self._native.lib.merge_directories(
        self._scheduler,
        self._to_value(_DirectoryDigests(directory_digests)),
      )
      return self._raise_or_return(result)
docs: Merges any number of directories.
  
      :param directory_digests: Tuple of DirectoryDigests.
      :return: A Digest.