#ifndef Py_CPYTHON_LISTOBJECT_H
#  error "this header file must not be included directly"
#endif

typedef struct {
    PyObject_VAR_HEAD
    /* Vector of pointers to list elements.  list[0] is ob_item[0], etc. */
    PyObject **ob_item;

    /* ob_item contains space for 'allocated' elements.  The number
     * currently in use is ob_size.
     * Invariants:
     *     0 ob_item[(index)])

static inline void
PyList_SET_ITEM(PyObject *op, Py_ssize_t index, PyObject *value) {
    PyListObject *list = _PyList_CAST(op);
    assert(0 allocated);
    list->ob_item[index] = value;
}
#define PyList_SET_ITEM(op, index, value) \
    PyList_SET_ITEM(_PyObject_CAST(op), (index), _PyObject_CAST(value))

PyAPI_FUNC(int) PyList_Extend(PyObject *self, PyObject *iterable);
PyAPI_FUNC(int) PyList_Clear(PyObject *self);