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: features.rs
    path of file: ./repos/trezor-firmware/rust/trezor-client/examples
    
    the code of the file until where you have to start completion: use std::io;

fn convert_path_from_str(derivation: &str) -> Vec<u32> {
    let derivation = derivation.to_string();
    let elements = derivation.split('/').skip(1).collect::<Vec<_>>();

    let mut path = vec![];
    for derivation_index in elements {
        let hardened = derivation_index.contains('\'');
        let mut index = derivation_index.replace('\'', "").parse::<u32>().unwrap();
        if hardened {
            index |= 0x80000000;
        }
        path.push(index);
    }

    path
}

fn device_selector() -> trezor_client::Trezor {
    let mut devices = trezor_client::find_devices(false);

    if devices.is_empty() {
        panic!("No devices connected");
    } else if devices.len() == 1
    
fn do_main() -> Result<(), trezor_client::Error> {
    // init with debugging
    tracing_subscriber::fmt().with_max_level(tracing::Level::TRACE).init();

    let mut trezor = device_selector();
    trezor.init_device(None)?;
    let f = trezor.features().expect("no features").clone();

    println!("Features:");
    println!("vendor: {}", f.vendor());
    println!("version: {}.{}.{}", f.major_version(), f.minor_version(), f.patch_version());
    println!("device id: {}", f.device_id());
    println!("label: {}", f.label());
    println!("is initialized: {}", f.initialized());
    println!("pin protection: {}", f.pin_protection());
    println!("passphrase protection: {}", f.passphrase_protection());
    println!(
        "{:?}",
        trezor.ethereum_get_address(convert_path_from_str("m/44'/60'/1'/0/0")).unwrap()
    );
    drop(trezor);

    let mut trezor2 = device_selector();

    trezor2.init_device(Some(f.session_id().to_vec()))?;

    println!(
        "{:?}",
        trezor2.ethereum_get_address(convert_path_from_str("m/44'/60'/1'/0/0")).unwrap()
    );
    //optional bool bootloader_mode = 5;          // is device in bootloader mode?
    //optional string language = 9;               // device language
    //optional bytes revision = 13;               // SCM revision of firmware
    //optional bytes bootloader_hash = 14;        // hash of the bootloader
    //optional bool imported = 15;                // was storage imported from an external source?
    //optional bool pin_cached = 16;              // is PIN already cached in session?
    //optional bool passphrase_cached = 17;       // is passphrase already cached in session?
    //optional bool firmware_present = 18;        // is valid firmware loaded?
    //optional bool needs_backup = 19;            // does storage need backup? (equals to
    // Storage.needs_backup) optional uint32 flags = 20;                 // device flags (equals
    // to Storage.flags) optional string model = 21;                 // device hardware model
    //optional uint32 fw_major = 22;              // reported firmware version if in bootloader
    // mode optional uint32 fw_minor = 23;              // reported firmware version if in
    // bootloader mode optional uint32 fw_patch = 24;              // reported firmware version
    // if in bootloader mode optional string fw_vendor = 25;             // reported firmware
    // vendor if in bootloader mode optional bytes fw_vendor_keys = 26;         // reported
    // firmware vendor keys (their hash) optional bool unfinished_backup = 27;       // report
    // unfinished backup (equals to Storage.unfinished_backup) optional bool no_backup = 28;
    // // report no backup (equals to Storage.no_backup)

    Ok(())
}