f_diff_filler(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
    if (in_vim9script() && check_for_lnum_arg(argvars, 0) == FAIL)
	return;

    rettv->vval.v_number = diff_check_fill(curwin, tv_get_lnum(argvars));
#endif
}
f_diff_filler(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
    if (in_vim9script() && check_for_lnum_arg(argvars, 0) == FAIL)
	return;

    rettv->vval.v_number = diff_check_fill(curwin, tv_get_lnum(argvars));
#endif
}