Comment (by Roland Haas):

Having said that… I can make the full ET compile with minimal modification (to GRHydro which contained a leftover STORAGE statement for conformal_state) when removing those inherits. It also passes all tests. I will propose them to be declared deprecated in the next release and removed afterwards.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2627/tmunu-inherits-from-admbase-and