! { dg-do run }
! PR libfortran/31210
program test
implicit none
integer :: l = 0
character(len=20) :: s
write(s,'(A,I1)') foo(), 0
if (trim(s) /= "0") call abort
contains
function foo()
character(len=l) :: foo
foo = "XXXX"
end function
end program test