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: lib.rs
    path of file: ./repos/hickory-dns/util/src
    
    the code of the file until where you have to start completion: // Copyright 2015-2022 Benjamin Fry <benjaminfry@me.com>
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// https://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// https://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, mod
    
pub fn logger(bin: &str, level: Option<tracing::Level>) {
    // Setup tracing for logging based on input
    let subscriber = EnvFilter::builder()
        .with_default_directive(LevelFilter::OFF.into())
        .parse(get_levels(bin, level))
        .expect("failed to configure tracing/logging");

    let formatter = tracing_subscriber::fmt::layer().compact();

    tracing_subscriber::registry()
        .with(formatter)
        .with(subscriber)
        .init();
}