24     type Strong;  typedef
34     fn view(&self) -> Option<Self::Strong>;  in view()
70     fn with_key<F, R>(view: &Self::Strong, f: F) -> R  in with_key()
74     fn hash<H: Hasher>(view: &Self::Strong, h: &mut H) {  in hash()
79     fn equals<Q>(view: &Self::Strong, key: &Q) -> bool  in equals()
88     type Strong = rc::Rc<T>;  typedef
94     fn view(&self) -> Option<Self::Strong> {  in view()
98     fn clone(view: &Self::Strong) -> Self::Strong {  in clone()
106     fn with_key<F, R>(view: &Self::Strong, f: F) -> R  in with_key()
114     type Strong = sync::Arc<T>;  typedef
120     fn view(&self) -> Option<Self::Strong> {  in view()
124     fn clone(view: &Self::Strong) -> Self::Strong {  in clone()
133     fn with_key<F, R>(view: &Self::Strong, f: F) -> R  in with_key()