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/risc0/examples/waldo/src/bin
    
    the code of the file until where you have to start completion: // Copyright 2024 RISC Zero, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::{error::Error, fs, path::PathBuf};

use clap::Parser;
use image::{io::Reader as ImageReader, GenericImageView, RgbImage};
use risc0_zkvm::Receipt;
use waldo_core::{
    image::{ImageMerkleTree, IMAGE_CHUNK_SIZE},
    Journal,
};
use waldo_methods::IMAGE_CROP_ID;

#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Args {
    /// Input file path to the full Where's Waldo image.
    /// Used to verify that the Waldo in the receipt actually came from this
    /// image.
    #[clap(short, long, value_parser, value_hint = clap::ValueHint::FilePath)]
    image: PathBuf,

    /// Input file path to fetch the receipt. Note that the receipt contains the
    /// cutout of waldo.
    #[clap(short = 'r', long, value_parser, default_value = "./receipt.bin", value_hint = clap::ValueHint::FilePath)]
    receipt: PathBuf,

    /// Output file path to save the cutout image of Waldo extracted from the
    /// receipt. SAFETY: Make sure to visually inspect the cutout and verify
    /// it really is Waldo and not some barber pole!
    #[clap(short = 'o', long, value_parser, default_value = "./waldo_cutout.png", value_hint = clap::ValueHint::FilePath)]
    waldo: PathBuf,

    /// Flag to disable displaying the Waldo cutout in the terminal.
    #[clap(long)]
    no_display: bool,
}

fn main() -> Result<(), Box<dyn Error>> {
    tracing_subscriber::fmt()
        .with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
        .init();
    ();

    let args = Args::parse();

    // Read the full Where's Waldo image from disk.
    let img = ImageReader::open(&args.image)?.decode()?;
    println!(
        "Read image at {} with size: {} x {}",
        &args.image.display(),
        img.width(),
        img.height()
    );

    // Constru
    
fn main() -> Result<(), Box<dyn Error>> {
    tracing_subscriber::fmt()
        .with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
        .init();
    ();

    let args = Args::parse();

    // Read the full Where's Waldo image from disk.
    let img = ImageReader::open(&args.image)?.decode()?;
    println!(
        "Read image at {} with size: {} x {}",
        &args.image.display(),
        img.width(),
        img.height()
    );

    // Construct a Merkle tree from the Where's Waldo image.
    let img_merkle_tree = ImageMerkleTree::<{ IMAGE_CHUNK_SIZE }>::new(&img);
    println!(
        "Created Merkle tree from image with root {:?}",
        img_merkle_tree.root(),
    );

    // Load and verify the receipt file.
    let receipt: Receipt = bincode::deserialize(&fs::read(&args.receipt)?)?;
    receipt.verify(IMAGE_CROP_ID)?;

    // Check consistency of the journal against the input Where's Waldo image.
    let journal: Journal = receipt.journal.decode()?;
    if &journal.root != &img_merkle_tree.root() {
        return Err(format!(
            "Image root in journal does not match the expected image: {:?} != {:?}",
            &journal.root,
            &img_merkle_tree.root(),
        )
        .into());
    }

    if journal.image_dimensions != img.dimensions() {
        return Err(format!(
            "Image dimensions in the journal do not match the expected image: {:?} != {:?}",
            journal.image_dimensions,
            img.dimensions(),
        )
        .into());
    }

    println!(
        "Verified receipt with {}x{} subimage",
        journal.subimage_dimensions.0, journal.subimage_dimensions.1
    );

    let subimage = RgbImage::from_raw(
        journal.subimage_dimensions.0,
        journal.subimage_dimensions.1,
        journal.subimage,
    )
    .ok_or("Failed to load the returned subimage bytes into an image")?;

    // Save the image to disk for the verifier to inspect.
    subimage.save(&args.waldo)?;
    println!("Saved Waldo cutout to {}", &args.waldo.display());

    if args.no_display {
        println!(
            "IMPORTANT: Verify that the cutout in {} contains Waldo.",
            &args.waldo.display()
        );
    } else {
        // Display the image in the terminal for them to see whether it's Waldo.
        let viuer_config = viuer::Config {
            absolute_offset: false,
            ..Default::default()
        };
        viuer::print_from_file(&args.waldo, &viuer_config)?;
        println!("Prover knows where this cutout is in the given image.");
        println!("Do you recognize this Waldo?");
    }

    Ok(())
}