| // 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() { |
| // Make sure we properly handle repeated self-appends. |
| let mut a: String = "A".to_string(); |
| let mut i = 20; |
| let mut expected_len = 1; |
| while i > 0 { |
| println!("{}", a.len()); |
| assert_eq!(a.len(), expected_len); |
| a = format!("{}{}", a, a); |
| i -= 1; |
| expected_len *= 2; |
| } |
| } |
