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: build.rs
    path of file: ./repos/snarkOS
    
    the code of the file until where you have to start completion: // Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkOS
    
fn check_file_licenses<P: AsRef<Path>>(path: P) {
    let path = path.as_ref();

    let mut iter = WalkDir::new(path).into_iter();
    while let Some(entry) = iter.next() {
        let entry = entry.unwrap();
        let entry_type = entry.file_type();

        // Skip the specified directories.
        if entry_type.is_dir() && DIRS_TO_SKIP.contains(&entry.file_name().to_str().unwrap_or("")) {
            iter.skip_current_dir();

            continue;
        }

        // Check all files with the ".rs" extension.
        if entry_type.is_file() && entry.file_name().to_str().unwrap_or("").ends_with(".rs") {
            let file = File::open(entry.path()).unwrap();
            let mut contents = Vec::with_capacity(EXPECTED_LICENSE_TEXT.len());
            file.take(EXPECTED_LICENSE_TEXT.len() as u64).read_to_end(&mut contents).unwrap();

            assert!(
                contents == EXPECTED_LICENSE_TEXT,
                "The license in \"{}\" is either missing or it doesn't match the expected string!",
                entry.path().display()
            );
        }
    }

    // Re-run upon any changes to the workspace.
    println!("cargo:rerun-if-changed=.");
}