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: tx_index.rs
    path of file: ./repos/rust-teos/teos/src
    
    the code of the file until where you have to start completion: use std::collections::{HashMap, VecDeque};
use std::fmt;
use std::hash::Hash;

use bitcoin::hash_types::BlockHash;
use bitcoin::{BlockHeader, Transaction, Txid};
use lightning_block_sync::poll::
    
    pub fn remove_disconnected_block(&mut self, block_hash: &BlockHash) {
        if let Some(ks) = self.tx_in_block.remove(block_hash) {
            self.index.retain(|k, _| !ks.contains(k));

            // Blocks should be disconnected from last backwards. Log if that's not the case so we can revisit this and fix it.
            if let Some(ref h) = self.blocks.pop_back() {
                if h != block_hash {
                    log::error!("Disconnected block does not match the oldest block stored in the TxIndex ({block_hash} != {h})");
                }
            }
        } else {
            log::warn!("The index is already empty");
        }
    }