} else {
            // we need to update the link from the chain
            entries[last] = swapNext(entries[last], getNext(entries[next]));
          }

          moveLastEntry(next);
          size--;
          modCount++;
          return oldValue;
        }
      }
      last = next;
      next = getNext(entries[next]);
    } while (next != UNSET);
    return 0;

      return NOT_FOUND;
    }

    Object oldValue = value(index);

    moveLastEntry(index, mask);
    size--;
    incrementModCount();

    return oldValue;
  }

  /**
   * Moves the last entry in the entry array into {@code dstIndex}, and nulls out its old position.
   */
  void moveLastEntry(int dstIndex, int mask) {
    Object table = requireTable();
    int[] entries = requireEntries();

      setSucceeds(lastEntry, index);
      setSucceeds(index, ENDPOINT);
      incrementModCount();
    }
  }

  @Override
  void moveLastEntry(int dstIndex, int mask) {
    int srcIndex = size() - 1;
    super.moveLastEntry(dstIndex, mask);

    setSucceeds(getPredecessor(dstIndex), getSuccessor(dstIndex));
    if (dstIndex < srcIndex) {
      setSucceeds(getPredecessor(srcIndex), dstIndex);

            /* values= */ null);
    if (index == -1) {
      return false;
    }

    moveLastEntry(index, mask);
    size--;
    incrementModCount();

    return true;
  }

  /**
   * Moves the last entry in the entry array into {@code dstIndex}, and nulls out its old position.
   */
  void moveLastEntry(int dstIndex, int mask) {
    Object table = requireTable();
    int[] entries = requireEntries();

      return NOT_FOUND;
    }

    Object oldValue = value(index);

    moveLastEntry(index, mask);
    size--;
    incrementModCount();

    return oldValue;
  }

  /**
   * Moves the last entry in the entry array into {@code dstIndex}, and nulls out its old position.
   */
  void moveLastEntry(int dstIndex, int mask) {
    Object table = requireTable();
    int[] entries = requireEntries();