Method insert

src/tree/binary/bst.rs:28–34

(&mut self, key: K, val: V)

    K: Ord,
{
    fn insert(&mut self, key: K, val: V) {
        if let Ok(x) = unsafe { insert(self.root, key, val) } {
            if self.root.is_none() {
                self.root = Some(x);
            }
        }
    }

    fn delete(&mut self, key: &K) {
        let node = unsafe { find(self.root, key) };