[Bug fortran/30874] New: incorrect error message for valid code

[jv244 at cam dot ac dot uk]

With recent trunk, gfortran incorrectly generates an error for the following
standard code:
program forall_9
  real, dimension (5, 5, 5, 5) :: a, b, c, d

  a (:, :, :, :) = 4
  forall (i = 1:5)
    a (i, i, 6 - i, i) = 7
  end forall
  forall (i = 1:5)
    a (i, 6 - i, i, i) = 7
  end forall
  forall (i = 1:5)
    a (6 - i, i, i, i) = 7
  end forall
  forall (i = 1:5:2)
    a (1, 2, 3, i) = 0
  end forall

  b = a
  c = a
  d = a

  forall (i = 1:5, j = 1:5, k = 1:5, any (a (i, j, k, :) .gt. 6))
    forall (l = 1:5, any (a (:, :, :, l) .lt. 2))
      a (i, j, k, l) = i - j + k - l + 0.5
    end forall
  end forall

  forall (l = 1:5, any (b (:, :, :, l) .lt. 2))
    forall (i = 1:5, j = 1:5, k = 1:5, any (b (i, j, k, :) .gt. 6))
      b (i, j, k, l) = i - j + k - l + 0.5
    end forall
  end forall

  forall (i = 1:5, j = 1:5, k = 1:5, any (c (i, j, k, :) .gt. 6))
    forall (l = 1:5, any (c (:, :, :, l) .lt. 2))
      c (i, j, k, l) = i - j + k - l + 0.5 + c (l, k, j, i)
    end forall
  end forall

  forall (l = 1:5, any (d (:, :, :, l) .lt. 2))
    forall (i = 1:5, j = 1:5, k = 1:5, any (d (i, j, k, :) .gt. 6))
      d (i, j, k, l) = i - j + k - l + 0.5 + d (l, k, j, i)
    end forall
  end forall

  do i = 1, 5
    do j = 1, 5
      do k = 1, 5
        do l = 1, 5
          r = 4
          if ((i == j .and. k == 6 - i) .or. (i == k .and. j == 6 - i)) then
            if (l /= 2 .and. l /= 4) then
              r = 1
            elseif (l == i) then
              r = 7
            end if
          elseif (j == k .and. i == 6 - j) then
            if (l /= 2 .and. l /= 4) then
              r = 1
            elseif (l == j) then
              r = 7
            end if
          elseif (i == 1 .and. j == 2 .and. k == 3 .and. l /= 2 .and. l /= 4)
then
            r = 0
          end if
          s = r
          if (r == 1) then
            r = i - j + k - l + 0.5
            if (((l == k .and. j == 6 - l) .or. (l == j .and. k == 6 - l))
.and. (i == l)) then
              s = r + 7
            elseif (k == j .and. l == 6 - k .and. i == k) then
              s = r + 7
            elseif (l /= 1 .or. k /= 2 .or. j /= 3 .or. i == 2 .or. i == 4)
then
              s = r + 4
            else
              s = r
            end if
          end if
          if (a (i, j, k, l) /= r) call abort ()
          if (c (i, j, k, l) /= s) call abort ()
        end do
      end do
    end do
  end do

  if (any (a /= b .or. c /= d)) call abort ()
end


-- 
           Summary: incorrect error message for valid code
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30874