   col_value = d;
        assert_equals(typeof a, 'string', 'first arg');
        assert_equals(b, 'data:text/javascript,for(;){}', 'second arg');
        assert_equals(typeof c, 'number', 'third arg');
    });
  </script>
  <script src="data:text/javascript,for(;){}"></script>
  <script>
    t.step(function(){
        assert_true(ran, 'ran');
        t.done();
    });
    t_col.step(function(){
        assert_equals(typeof col_value, 'number', 'fourth arg');
        t_col.done();
    });
  </script>
 </bod