update the update_state method

packages/native-core/src/tree.rs

@@ -1,11 +1,6 @@
-use core::panic;
-use parking_lot::lock_api::RawMutex as _;
-use parking_lot::{RawMutex, RwLock};
 use slab::Slab;
-use std::cell::UnsafeCell;
 use std::collections::VecDeque;
 use std::marker::PhantomData;
-use std::sync::Arc;
 
 #[derive(Hash, PartialEq, Eq, Clone, Copy, Debug, PartialOrd, Ord)]
 pub struct NodeId(pub usize);