anchor.diff:                    file.closeHandler = () {
                       // Now read the contents of the file just written.
                       List<int> buffer2 = new List<int>(bytes_read);
  -                    file = new File(getFilename(outFilenameBase + "_out"));
  +                    file = new File(outFilename);
                       file.errorHandler = (s) {
                         Expect.fail("No errors expected");
                       };
  
positive.code:     }
      Expect.equals(true, exceptionCaught);
      Expect.equals(true, !wrongExceptionCaught);
      return 1;
    }
  
  
negative.code:     bool exceptionCaught = false;
      bool wrongExceptionCaught = false;
      String filename = getFilename("tests/vm/data/fixed_length_file");
      File input = new File(filename + "_out_close_exception");
      input.openSync(true);
      input.closeSync();
      try {
  