Hi Zhiyi, On 1/20/20 4:41 AM, Zhiyi Zhang wrote: > - ok( ret == 0 - 'a', "wrong ret %d\n", ret ); > + ok( ret == 0 - 'a' || ret < 0, "wrong ret %d\n", ret ); It would be better to compare ret to -1 instead of <0. Thanks, Piotr