Interface RedBlackTree

src/tree/binary/rb.rs:128–130

todo: rb tree delete, Chris Okasaki insert-fix

//todo: rb tree delete, Chris Okasaki insert-fix
pub trait RedBlackTree<K, V> {
    fn insert(&mut self, key: K, val: V);
}

impl<K, V> RedBlackTree<K, V> for Tree<K, V>
where