description

# removeLast method Null safety

E removeLast ()
override

Removes and returns the last element of the queue.

The queue must not be empty when this method is called.

## Implementation

    E removeLast() {
      _DoubleLinkedQueueEntry<E> lastEntry =
          _sentinel._previousLink as _DoubleLinkedQueueEntry<E>;
      E result = lastEntry._remove();
      _elementCount--;
      return result;
    }