648     PyObject *readnl;  member
816     PyObject *old = self->readnl;  in set_newline()
818         self->readnl = NULL;  in set_newline()
821         self->readnl = PyUnicode_FromString(newline);  in set_newline()
822         if (self->readnl == NULL) {  in set_newline()
823             self->readnl = old;  in set_newline()
830     if (!self->readuniversal && self->readnl != NULL) {  in set_newline()
832         assert(PyUnicode_KIND(self->readnl) == PyUnicode_1BYTE_KIND);  in set_newline()
833         self->writenl = (const char *)PyUnicode_1BYTE_DATA(self->readnl);  in set_newline()
1060     Py_CLEAR(self->readnl);  in _io_TextIOWrapper___init___impl()
1366     Py_CLEAR(self->readnl);  in textiowrapper_clear()
1398     Py_VISIT(self->readnl);  in textiowrapper_traverse()
1929     int translated, int universal, PyObject *readnl,  in _PyIO_find_line_ending()  argument
1973         Py_ssize_t readnl_len = PyUnicode_GET_LENGTH(readnl);  in _PyIO_find_line_ending()
1974         Py_UCS1 *nl = PyUnicode_1BYTE_DATA(readnl);  in _PyIO_find_line_ending()
1976         assert(PyUnicode_KIND(readnl) == PyUnicode_1BYTE_KIND);  in _PyIO_find_line_ending()
2080             self->readtranslate, self->readuniversal, self->readnl,  in _textiowrapper_readline()