Example doubly_linked_list.rs is broken

[grothesque]

Said example has been broken since commit cd8ed85. Curiously, the title of that commit is “Updated examples.” Has no one bothered to run the example after it has bee modified?

% cargo run --example doubly_linked_list
   Compiling slotmap v1.1.1 (/tmp/slotmap)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.39s
     Running `target/debug/examples/doubly_linked_list`

thread 'main' (22205) panicked at examples/doubly_linked_list.rs:124:5:
assertion `left == right` failed
  left: 5
 right: 4