namespace a
  namespace b
    namespace c {}

struct listnode
  void* varptr;
  struct listnode* next;
;

void list_push_front(struct listnode head, void* ptr)
  struct listnode newfirst = {varptr: ptr,
                              next: head.next};
  struct listnode* fst = malloc(sizeof(struct listnode));
  *fst = newfirst;
  head.next = fst;

void list_push_back(struct listnode head, void* ptr)
  struct listnode current = head;
  while (current.next != NULL)
    current = *(current.next);
  struct listnode newlast = {varptr: ptr, next: NULL};
  struct listnode* lst = malloc(sizeof(struct listnode));
  *lst = newlast;
  current.next = lst;