--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gfortran.dg/backspace_1.f	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,82 @@
+! This file is all about BACKSPACE
+! { dg-do run { target fd_truncate } }
+
+      integer i, n, nr
+      real x(10), y(10)
+
+! PR libfortran/20068
+      open (20, status='scratch')
+      write (20,*) 1
+      write (20,*) 2
+      write (20,*) 3
+      rewind (20)
+      read (20,*) i
+      if (i .ne. 1) call abort
+      write (*,*) ' '
+      backspace (20)
+      read (20,*) i
+      if (i .ne. 1) call abort
+      close (20)
+
+! PR libfortran/20125
+      open (20, status='scratch')
+      write (20,*) 7
+      backspace (20)
+      read (20,*) i
+      if (i .ne. 7) call abort
+      close (20)
+
+      open (20, status='scratch', form='unformatted')
+      write (20) 8
+      backspace (20)
+      read (20) i
+      if (i .ne. 8) call abort
+      close (20)
+
+! PR libfortran/20471
+      do n = 1, 10
+        x(n) = sqrt(real(n))
+      end do
+      open (3, form='unformatted', status='scratch')
+      write (3) (x(n),n=1,10)
+      backspace (3)
+      rewind (3)
+      read (3) (y(n),n=1,10)
+
+      do n = 1, 10
+        if (abs(x(n)-y(n)) > 0.00001) call abort
+      end do
+      close (3)
+
+! PR libfortran/20156
+      open (3, form='unformatted', status='scratch')
+      do i = 1, 5
+        x(1) = i
+        write (3) n, (x(n),n=1,10)
+      end do
+      nr = 0
+      rewind (3)
+  20  continue
+      read (3,end=30,err=90) n, (x(n),n=1,10)
+      nr = nr + 1
+      goto 20
+  30  continue
+      if (nr .ne. 5) call abort
+
+      do i = 1, nr+1
+        backspace (3)
+      end do
+
+      do i = 1, nr
+        read(3,end=70,err=90) n, (x(n),n=1,10)
+        if (abs(x(1) - i) .gt. 0.001) call abort
+      end do
+      close (3)
+      stop
+
+  70  continue
+      call abort
+  90  continue
+      call abort
+
+      end