long accessTime = e.getAccessTime();
        assertTrue(accessTime >= lastAccessTime);
        lastAccessTime = accessTime;
        long writeTime = e.getWriteTime();
        assertTrue(writeTime >= lastWriteTime);
        lastWriteTime = writeTime;
      }

      lastAccessTime = 0;
      lastWriteTime = 0;
      for (ReferenceEntry<K, V> e : segment.accessQueue) {

        long accessTime = e.getAccessTime();
        assertTrue(accessTime >= lastAccessTime);
        lastAccessTime = accessTime;
        long writeTime = e.getWriteTime();
        assertTrue(writeTime >= lastWriteTime);
        lastWriteTime = writeTime;
      }

      lastAccessTime = 0;
      lastWriteTime = 0;
      for (ReferenceEntry<K, V> e : segment.accessQueue) {

    }

    // The code below is exactly the same for each write entry type.

    volatile long writeTime = Long.MAX_VALUE;

    @Override
    public long getWriteTime() {
      return writeTime;
    }

    @Override
    public void setWriteTime(long time) {
      this.writeTime = time;
    }

    // Guarded By Segment.this
    @Weak ReferenceEntry<K, V> nextWrite = nullEntry();

	if err != nil {
		err = msgp.WrapError(err, "DataDir")
		return
	}
	err = en.WriteBool(z.XLV1)
	if err != nil {
		err = msgp.WrapError(err, "XLV1")
		return
	}
	err = en.WriteTime(z.ModTime)
	if err != nil {
		err = msgp.WrapError(err, "ModTime")
		return
	}
	err = en.WriteInt64(z.Size)
	if err != nil {
		err = msgp.WrapError(err, "Size")
		return
	}