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: header_name.rs
    path of file: ./repos/phaser/phaser/vendor/http/benches
    
    the code of the file until where you have to start completion: #![feature(test)]

extern crate bytes;
extern crate http;
extern crate test;

use http::header::HeaderName;
use test::Bencher;

fn make_all_known_header
    
fn header_name_various(b: &mut Bencher) {
    let all_known_headers = make_all_known_headers();
    b.iter(|| {
        for name in &all_known_headers{
            HeaderName::from_bytes(name.as_slice()).unwrap();
        }
    });
}