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: mod.rs
    path of file: ./repos/ckb/test/src/specs
    
    the code of the file until where you have to start completion: mod alert;
mod consensus;
mod dao;
mod hardfork;
mod mining;
mod p2p;
mod relay;
mod rpc;
mod sync;
mod tx_pool;

pub use alert::*;
pub use consensus::*;
pub use dao::*;
pub use hardfork::*;
pub use mining::*;
pub use p2p::*;
pub use relay::*;
pub use rpc::*;
pub use sync::*;
pub use tx_pool::*;

use crate::Node;
use ckb_ap
    
    fn before_run(&self) -> Vec<Node> {
        let mut nodes = (0..self.setup().num_nodes)
            .map(|i| Node::new(self.name(), &format!("node{i}")))
            .collect::<Vec<_>>();
        nodes
            .iter_mut()
            .for_each(|node| node.modify_app_config(|config| self.modify_app_config(config)));
        nodes
            .iter_mut()
            .for_each(|node| node.modify_chain_spec(|spec| self.modify_chain_spec(spec)));
        nodes.iter_mut().for_each(|node| node.start());
        nodes
    }