rust/src/test/run-pass/string-self-append.rs
2013-03-29 16:39:08 -07:00

26 lines
841 B
Rust

// 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.
extern mod std;
pub fn main() {
// Make sure we properly handle repeated self-appends.
let mut a: ~str = ~"A";
let mut i = 20;
let mut expected_len = 1u;
while i > 0 {
error!(str::len(a));
assert!((str::len(a) == expected_len));
a = a + a; // FIXME(#3387)---can't write a += a
i -= 1;
expected_len *= 2u;
}
}