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: app.rs
    path of file: ./repos/ethers-rs/ethers-signers/src/trezor
    
    the code of the file until where you have to start completion: #![allow(unused)]
use trezor_client::client::{AccessListItem as Trezor_AccessListItem, Trezor};

use futures_executor::block_on;
use futures_util::lock::Mutex;

use ethers_core::{
    types::{
        transaction::{eip2718::TypedTransaction, eip712::Eip712},
        Address, NameOrAddress, Signature, Transaction, TransactionRequest, TxHash, H256, U256,
    },
    utils::keccak256,
};
use home;
use std::{
    convert::TryFrom,
    env, fs,
    io::{Read, Write},
    path,
    path::PathBuf,
};
use thiserror::Error;

use super::types::*;

/// A Trezor Ethereum App.
///
/// This is a simple wrapper around the [Trezor trans
    
    fn check_version(version: String) -> Result<(), TrezorError> {
        let version = semver::Version::parse(&version)?;

        let min_version = match version.major {
            1 => FIRMWARE_1_MIN_VERSION,
            2 => FIRMWARE_2_MIN_VERSION,
            // unknown major version, possibly newer models that we don't know about yet
            // it's probably safe to assume they support EIP-1559 and EIP-712
            _ => return Ok(()),
        };

        let req = semver::VersionReq::parse(min_version)?;
        // Enforce firmware version is greater than "min_version"
        if !req.matches(&version) {
            return Err(TrezorError::UnsupportedFirmwareVersion(min_version.to_string()))
        }

        Ok(())
    }