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! { dg-do compile } ! { dg-options "-O1" } SUBROUTINE check_for_overlap (cell_length) REAL, DIMENSION(1:3), INTENT(IN), OPTIONAL :: cell_length REAL, DIMENSION(1:3) :: abc, box_length IF (PRESENT(cell_length)) THEN box_length(1:3)=abc(1:3) ENDIF END SUBROUTINE check_for_overlap