Extra continuous symbol (&) in pragma can break the parsing

[clementval]

The following code breaks because of the & and no real continuation of the pragma. As pragma are comments and not really part of the standard, this is really up to the compiler to decide to accept this or not. gfortran accepts it for example.

MODULE mod1

contains

  SUBROUTINE sub1()
    integer :: i
    
    !$acc parallel loop gang vector &
    do i = 1, 10
    end do
  END SUBROUTINE sub1

END MODULE mod1

"dummy.f90:mod1", line 10: 'do' is not found for 'enddo'