Macro intrusive_splay_tree::impl_intrusive_node

macro_rules! impl_intrusive_node {
    (
        impl< $($typarams:tt),* >
            IntrusiveNode<$intrusive_node_lifetime:tt>
            for $tree:ty
        where
            type Elem = $elem:ty ,
            node = $node:ident ;
    ) => { ... };
}

Implement IntrusiveNode for a particular kind of SplayTree and its element type.