gcc/testsuite/gfortran.dg/rewind_1.f90

   1 ! { dg-do run }
   2 ! { dg-options "-std=legacy" }
   3 !
   4 ! Check that rewind doesn't delete a file.
   5 ! Writing to the file truncates it at the end of the current record.  Out
   6 ! IO library was defering the actual truncation until the file was rewound.
   7 ! A second rewind would then (incorrectly) think the file had just been
   8 ! written to, and truncate the file to zero length.
   9 program foo
  10   character*11 s
  11   open(unit=11, status="SCRATCH")
  12   write(11, '(a11)') "Hello World"
  13   rewind(11)
  14   rewind(11)
  15   s = ""
  16   read(11, '(a11)') s
  17   close(11)
  18   if (s .ne. "Hello World") call abort
  19 end program
  20