errno = 0;
ASSERT (renameat (dfd, BASE "sub2/.", dfd, BASE "sub1") == -1);
ASSERT (errno == EINVAL || errno == EBUSY || errno == EEXIST);
errno = 0;
ASSERT (renameat (dfd, BASE "sub2/.", dfd, BASE "sub1") == -1);
ASSERT (errno == EINVAL || errno == EBUSY || errno == EEXIST);