650     PyObject *readnl;  member
827     PyObject *old = self->readnl;  in set_newline()
829         self->readnl = NULL;  in set_newline()
832         self->readnl = PyUnicode_FromString(newline);  in set_newline()
833         if (self->readnl == NULL) {  in set_newline()
834             self->readnl = old;  in set_newline()
841     if (!self->readuniversal && self->readnl != NULL) {  in set_newline()
843         assert(PyUnicode_KIND(self->readnl) == PyUnicode_1BYTE_KIND);  in set_newline()
844         self->writenl = (const char *)PyUnicode_1BYTE_DATA(self->readnl);  in set_newline()
1114     Py_CLEAR(self->readnl);  in _io_TextIOWrapper___init___impl()
1420     Py_CLEAR(self->readnl);  in textiowrapper_clear()
1452     Py_VISIT(self->readnl);  in textiowrapper_traverse()
2045     int translated, int universal, PyObject *readnl,  in _PyIO_find_line_ending()  argument
2089         Py_ssize_t readnl_len = PyUnicode_GET_LENGTH(readnl);  in _PyIO_find_line_ending()
2090         const Py_UCS1 *nl = PyUnicode_1BYTE_DATA(readnl);  in _PyIO_find_line_ending()
2092         assert(PyUnicode_KIND(readnl) == PyUnicode_1BYTE_KIND);  in _PyIO_find_line_ending()
2196             self->readtranslate, self->readuniversal, self->readnl,  in _textiowrapper_readline()