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: get-object-presigned.rs
    path of file: ./repos/aws-doc-sdk-examples/rustv1/examples/s3/src/bin
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

#![allow(clippy::result_large_err)]

use aws_config::meta::region::RegionProviderChain;
use aws_sdk_s3::presigning::PresigningConfig;
use aws_sdk_s3::{config::Region, meta::PKG_VERSION, Client};
use clap::Parser;
use std::error::Error;
use std::time::Durat
    
async fn main() -> Result<(), Box<dyn Error>> {
    tracing_subscriber::fmt::init();

    let Opt {
        region,
        bucket,
        object,
        expires_in,
        verbose,
    } = Opt::parse();

    let region_provider = RegionProviderChain::first_try(region.map(Region::new))
        .or_default_provider()
        .or_else(Region::new("us-west-2"));

    let shared_config = aws_config::from_env().region(region_provider).load().await;
    let client = Client::new(&shared_config);

    println!();

    if verbose {
        println!("S3 client version: {}", PKG_VERSION);
        println!("Region:            {}", shared_config.region().unwrap());
        println!("Bucket:            {}", &bucket);
        println!("Object:            {}", &object);
        println!("Expires in:        {} seconds", expires_in.unwrap_or(900));
        println!();
    }

    get_object(&client, &bucket, &object, expires_in.unwrap_or(900)).await
}