Comment (by Roland Haas):

Ah, one exception: we do worry about assignment without parenthesis in the case of grid scalars eg ADMBase::shift_state would be accessed like this if(shift_state .ne. 0) then STOP endif. Though I am not sure if either charater*8 or logical*8 would prevent this (I suspect not).

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