It's not just linked lists. From the article: > The next step of course is to write your own equivalents of malloc and free to allocate and deallocate objects

It's not just linked lists. From the article: > The next step of course is to write your own equivalents of malloc and free to allocate and deallocate objects within the arena. A logic bug in that "allocator" - which are plain indices and not covered by borrow checking - could 100% stomp memory.