def has_storage(self, address):
storage = self._world_state[address]['<STR_LIT>']<EOL>array = storage.array<EOL>while not isinstance(array, ArrayVariable):<EOL><INDENT>if isinstance(array, ArrayStore):<EOL><INDENT>return True<EOL><DEDENT>array = array.array<EOL><DEDENT>return False<EOL>
True if something has been written to the storage.
Note that if a slot has been erased from the storage this function may
lose any meaning.