ZPOOL_CONFIG_UNSUP_FEAT
verify(nvlist_lookup_nvlist(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT,
nvlist_exists(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT)) {
ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0);
ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat);