rust/src/test/run-pass/format-ref-cell.rs

// Copyright 2012-2014 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.

use std::cell::RefCell;

pub fn main() {
    let name = RefCell::new("rust");
    let what = RefCell::new("rocks");
    let msg = format!("{name} {}", &*what.borrow(), name=&*name.borrow());
    assert_eq!(msg, "rust rocks".to_string());
}