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Max Toro may have found an error here: http://stackoverflow.com/questions/35400809/visibility-of-an-overriden-component/35416053#35416053
Noted also that there is another error in the example: package-version is required.
We convinced ourselves that the visibility of C(P) should be private, but that otherwise the example appeared to be correct.
Agreed to fix the two errors identified above.