You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: table.rs
    path of file: ./repos/redb/src
    
    the code of the file until where you have to start completion: use crate::db::TransactionGuard;
use crate::sealed::Sealed;
use crate::tree_store::{
    AccessGuardMut, Btree, BtreeDrain, BtreeDrainFilter, BtreeHeader, BtreeMut, BtreeRangeIter,
    PageHint, PageNumber, RawBtree, TransactionalMemory, MAX_VALUE_LENGTH,
};
use crate::types::{Key, MutInPlaceValue, Value};
use crate::{AccessGuard, StorageError, Writ
    
    pub fn pop_last(&mut self) -> Result<Option<(AccessGuard<K>, AccessGuard<V>)>> {
        // TODO: optimize this
        let last = self
            .iter()?
            .next_back()
            .map(|x| x.map(|(key, _)| K::as_bytes(&key.value()).as_ref().to_vec()));
        if let Some(owned_key) = last {
            let owned_key = owned_key?;
            let key = K::from_bytes(&owned_key);
            let value = self.remove(&key)?.unwrap();
            drop(key);
            Ok(Some((AccessGuard::with_owned_value(owned_key), value)))
        } else {
            Ok(None)
        }
    }