rust/src/test/run-pass/issue-4541.rs

// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

fn parse_args() -> String {
    let args: Vec<_> = ::std::env::args().collect();
    let mut n = 0;

    while n < args.len() {
        match &*args[n] {
            "-v" => (),
            s => {
                return s.to_string();
            }
        }
        n += 1;
    }

    return "".to_string()
}

pub fn main() {
    println!("{}", parse_args());
}