Function lappend

src/backend/nodes/list.c:335–348

* Append a pointer to the list. A pointer to the modified list is * returned. Note that this function may or may not destructively * modify the list; callers should always use this function's return * value, rather than continuing to use the pointer passed as the * first argument. */

 * first argument.
 */
List *
lappend(List *list, void *datum)
{
	Assert(IsPointerList(list));

	if (list == NIL)
		list = new_list(T_List, 1);
	else
		new_tail_cell(list);

	llast(list) = datum;
	check_list_invariants(list);
	return list;
}

/*
 * Append an integer to the specified list. See lappend()