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: list-identity-pool-usage.rs
    path of file: ./repos/aws-doc-sdk-examples/rustv1/examples/cognitosync/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_cognitosync::error::DisplayErrorContext;
use aws_sdk_cognitosync::{config::Region, meta::PKG_VERSION, Client};
use aws_smithy_types_convert::date_time::DateTimeExt;
use clap::Parser;
use cognitosync_code_
    
async fn show_pools(client: &Client) -> Result<(), Error> {
    let response = client
        .list_identity_pool_usage()
        .max_results(10)
        .send()
        .await?;

    let pools = response.identity_pool_usages();
    println!("Identity pools:");

    for pool in pools {
        println!(
            "  Identity pool ID:    {}",
            pool.identity_pool_id().unwrap_or_default()
        );
        println!(
            "  Data storage:        {}",
            pool.data_storage().unwrap_or_default()
        );
        println!(
            "  Sync sessions count: {}",
            pool.sync_sessions_count().unwrap_or_default()
        );
        println!(
            "  Last modified:       {}",
            pool.last_modified_date().unwrap().to_chrono_utc()?
        );
        println!();
    }

    println!("Next token: {}", response.next_token().unwrap_or_default());

    Ok(())
}