1! Like array_constructor_6.f90, but check iterators with non-default stride,
2! including combinations which lead to zero-length vectors.
3! { dg-do run }
4! { dg-options "-Wzerotrip" }
5program main
6  implicit none
7  call build (77)
8contains
9  subroutine build (order)
10    integer :: order, i, j
11
12    call test (1, 11, 3, (/ (i, i = 1, 11, 3) /))
13    call test (3, 20, 2, (/ (i, i = 3, 20, 2) /))
14    call test (4, 0, 11, (/ (i, i = 4, 0, 11) /)) ! { dg-warning "will be executed zero times" }
15
16    call test (110, 10, -3,  (/ (i, i = 110, 10, -3) /))
17    call test (200, 20, -12, (/ (i, i = 200, 20, -12) /))
18    call test (29, 30, -6,   (/ (i, i = 29, 30, -6) /)) ! { dg-warning "will be executed zero times" }
19
20    call test (1, order, 3,  (/ (i, i = 1, order, 3) /))
21    call test (order, 1, -3, (/ (i, i = order, 1, -3) /))
22
23    ! Triggers compile-time iterator calculations in trans-array.c
24    call test (1, 1000, 2,   (/ (i, i = 1, 1000, 2),   (i, i = order, 0, 1) /))
25    call test (1, 0, 3,      (/ (i, i = 1, 0, 3),      (i, i = order, 0, 1) /)) ! { dg-warning "will be executed zero times" }
26    call test (1, 2000, -5,  (/ (i, i = 1, 2000, -5),  (i, i = order, 0, 1) /)) ! { dg-warning "will be executed zero times" }
27    call test (3000, 99, 4,  (/ (i, i = 3000, 99, 4),  (i, i = order, 0, 1) /)) ! { dg-warning "will be executed zero times" }
28    call test (400, 77, -39, (/ (i, i = 400, 77, -39), (i, i = order, 0, 1) /))
29
30    do j = -10, 10
31      call test (order + j, order, 5,  (/ (i, i = order + j, order, 5) /))
32      call test (order + j, order, -5, (/ (i, i = order + j, order, -5) /))
33    end do
34
35  end subroutine build
36
37  subroutine test (from, to, step, values)
38    integer, dimension (:) :: values
39    integer :: from, to, step, last, i
40
41    last = 0
42    do i = from, to, step
43      last = last + 1
44      if (values (last) .ne. i) call abort
45    end do
46    if (size (values, dim = 1) .ne. last) call abort
47  end subroutine test
48end program main
49