use observable_tree::BTree;
#[tokio::main]
async fn main() {
let btree = BTree::start(1000);
let ins = btree.insert("hello".to_string(), 546).await;
assert!(ins.unwrap().is_none());
let cont = btree.contains("hello".to_string()).await;
assert!(cont.unwrap());
print!("Done!")
}