Comment (by Roland Haas):

Interesting. A logical*8 would still be viable (there is no bounds check for it). I’d rather risk cases of grid scalars not being found (read only at least, write access is caught due to INTENT(IN)) than having lots of “unused actual argument” warnings.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2571/runtime-failure-due-to-useing-character-8