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! Test: substring with end < start yields zero-length string (F2018 9.4.1)
program string_107
implicit none
character(len=5) :: s = "hello"
character(len=:), allocatable :: res
integer :: j
! s(1:-1) should be zero-length
j = 0
res = trim(s(1:j-1))
if (len(res) /= 0) error stop
! s(3:2) should be zero-length
res = s(3:2)
if (len(res) /= 0) error stop
! s(5:1) should be zero-length
res = s(5:1)
if (len(res) /= 0) error stop
! Normal substring still works
res = s(2:4)
if (len(res) /= 3) error stop
if (res /= "ell") error stop
! s(1:1) single character
res = s(1:1)
if (len(res) /= 1) error stop
if (res /= "h") error stop
print *, "ok"
end program string_107
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