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: trust_dns.rs
    path of file: ./repos/reqwest/src/dns
    
    the code of the file until where you have to start completion: //! DNS resolution via the [trust_dns_resolver](https://github.com/bluejekyll/trust-dns) crate

use hyper_util::client::legacy::connect::dns::Name;
use once_cell::sync::OnceCell;
use trust_dns_resolver::{lookup_ip::LookupIpIntoIter, system_co
    
fn new_resolver() -> io::Result<TokioAsyncResolver> {
    let (config, opts) = system_conf::read_system_conf().map_err(|e| {
        io::Error::new(
            io::ErrorKind::Other,
            format!("error reading DNS system conf: {e}"),
        )
    })?;
    Ok(TokioAsyncResolver::tokio(config, opts))
}