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: verify.rs
    path of file: ./repos/wire-server/libs/libzauth/libzauth/examples
    
    the code of the file until where you have to start completion: // This file is part of the Wire Server implementation.
//
// Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option) any
// later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License along
// with this program. If not, see <https://www.gnu.org/licenses/>.

extern crate clap;
extern crate zauth;

use clap::{Arg, Command};
use std::path::Path;
use std::process;
use zauth::{Token, Keystore};

pub fn main() {
    let args = Command::new(
    
pub fn main() {
    let args = Command::new("verify")
        .about("Test application verifying tokens")
        .arg(Arg::new("store")
             .required(true)
             .short('s')
             .long("store")
             .value_name("FILE")
             .help("Keystore")
             .takes_value(true))
        .arg(Arg::new("token")
             .required(true)
             .short('t')
             .long("token")
             .value_name("STRING")
             .help("Token string to verify")
             .takes_value(true))
        .get_matches();

    let path   = args.value_of("store").unwrap();
    let string = args.value_of("token").unwrap();

    let ks = Keystore::open(&Path::new(&path)).unwrap_or_else(|e| {
        println!("Failed to open keystore: {}", e);
        process::exit(1)
    });

    let tk = Token::parse(&string).unwrap_or_else(|e| {
        println!("Failed to parse token string: {}", e);
        process::exit(2)
    });

    tk.verify(&ks).unwrap_or_else(|e| {
        println!("Failed to verify token: {}", e);
        process::exit(3)
    })
}