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abdd4536ce
A report of the following code not generating an error led to fixing two bugs in directive checking. - We should treat CombinedConstructs as OpenACC Constructs - We should treat DoConstruct index variables as private. ```fortran subroutine sub(nn) integer :: nn, ii !$acc serial loop default(none) do ii = 1, nn end do !$acc end serial loop end subroutine ``` Here `nn` should be flagged as needing a data clause while `ii` should still get one implicitly.