rust/src/test/run-pass/estr-uniq.rs

// Copyright 2012 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.

pub fn main() {
    let x : ~str = ~"hello";
    let _y : ~str = ~"there";
    let mut z = ~"thing";
    z = x;
    assert z[0] == ('h' as u8);
    assert z[4] == ('o' as u8);
}