compile_expr3(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
{
    int		ppconst_used = ppconst->pp_used;

    // get the first variable
    if (compile_expr4(arg, cctx, ppconst) == FAIL)
	return FAIL;

    // || and && work almost the same
    return compile_and_or(arg, cctx, "&&", ppconst, ppconst_used);
}
compile_expr3(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
{
    int		ppconst_used = ppconst->pp_used;

     
    if (compile_expr4(arg, cctx, ppconst) == FAIL)
	return FAIL;

     
    return compile_and_or(arg, cctx, "&&", ppconst, ppconst_used);
}