I suspect that there is something going on with my circular includes, as I do not get the warning if I remove one half of circle. I think the problem is caused by 'use' commands in each module interacting badly with 'use' commands in the super-package that ties everything together. As the modules are never used except through this, I have removed all the redundant calls, and the warnings seem to have disappeared.
Thanks to everyone for their help!
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