11     fn is_zero(&self) -> bool;  in is_zero()  argument
18             fn is_zero(&self) -> bool {
39 impl_is_zero!(bool, |x| x == false);
47     fn is_zero(&self) -> bool {  in is_zero()  argument
54     fn is_zero(&self) -> bool {  in is_zero()  argument
61     fn is_zero(&self) -> bool {  in is_zero()  argument
82             fn is_zero(&self) -> bool{
108     fn is_zero(&self) -> bool {  in is_zero()  argument
115     fn is_zero(&self) -> bool {  in is_zero()  argument
131             fn is_zero(&self) -> bool {
157             fn is_zero(&self) -> bool {
172     fn is_zero(&self) -> bool {  in is_zero()  argument
179     fn is_zero(&self) -> bool {  in is_zero()  argument
188             fn is_zero(&self) -> bool {
200     Option<bool>,
201     Option<Option<bool>>,
202     Option<Option<Option<bool>>>,