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/ethers-rs/ethers-signers/src/trezor
    
    the code of the file until where you have to start completion: pub mod app;
pub mod types;

use crate::Signer;
use app::TrezorEthereum;
use async_trait::async_trait;
use ethers_core::types::{
    transaction::{eip2718::TypedTransaction, eip712::Eip712},
    Add
    
    async fn sign_transaction(&self, message: &TypedTransaction) -> Result<Signature, Self::Error> {
        let mut tx_with_chain = message.clone();
        if tx_with_chain.chain_id().is_none() {
            // in the case we don't have a chain_id, let's use the signer chain id instead
            tx_with_chain.set_chain_id(self.chain_id);
        }
        self.sign_tx(&tx_with_chain).await
    }