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In a related issue (421) some code in the hierarchy tree was found to be impossible. Specifically, it could not reasonably be expected to compile. In fact, it couldn't. But it didn't cause problems because the functions weren't actually exercised. Because the functions were templated, the compiler just ignored them.
Given that no one is calling them, they clearly serve no purpose. So, they are being cut out rather than fixed.
closes #421
This change is