Code shared from the Rust Playground

playground.rs

fn f<T: AsRef<str>>(args: &[T]) 
{
    let bargv = &["foo", "bar"];
    let nargv : Vec<&str> = bargv.iter().map(|&v|v).chain(args.iter().map(AsRef::as_ref)).collect();
    println!("{:?}", nargv);
}

fn main() {
    let args : Vec<String> = std::env::args().collect();
    f(&args);
}