Method prev

cranelift/bforest/src/map.rs:340–346

(
        &mut self,
        root: &PackedOption<Node>,
        pool: &NodePool<MapTypes<K, V>>,
    )

    }

    fn prev(
        &mut self,
        root: &PackedOption<Node>,
        pool: &NodePool<MapTypes<K, V>>,
    ) -> Option<(K, V)> {
        root.expand().and_then(|root| self.path.prev(root, pool))
    }

    fn key(&self, pool: &NodePool<MapTypes<K, V>>) -> Option<K> {
        self.path