--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/dtio_15.f90	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,33 @@
+! { dg-do run }
+! Test that inquire of string internal unit in child process errors.
+module string_m
+  implicit none
+  type person
+    character(10) :: aname
+    integer :: ijklmno
+  contains
+    procedure :: write_s
+    generic :: write(formatted) => write_s
+  end type person
+contains
+  subroutine write_s (this, lun, iotype, vlist, istat, imsg)
+    class(person), intent(in)       :: this
+    integer, intent(in)             :: lun
+    character(len=*), intent(in)    :: iotype
+    integer, intent(in)             :: vlist(:)
+    integer, intent(out)            :: istat
+    character(len=*), intent(inout) :: imsg
+    integer :: filesize
+    inquire( unit=lun, size=filesize, iostat=istat, iomsg=imsg)
+    if (istat /= 0) return
+  end subroutine write_s
+end module string_m
+program p
+   use string_m
+   type(person) :: s
+   character(len=12) :: msg
+   integer :: istat
+   character(len=256) :: imsg = ""
+   write( msg, "(DT)", iostat=istat) s
+   if (istat /= 5018) call abort
+end program p