
includes the operation ar >> T * so that tracking information
will be included in the archive. When a program which
creates the archive doesn't include ar << T it is presumed
that the archive doesn't include tracking information and
the archive will fail to load.  Also the reverse situation could 
trigger a similar problem.
<p>
Though this situation is unlikely for several reasones, 
it is possible - hence this warning. 
</ul>
So if your program traps here, consider changing the 
tracking or implementation