| // 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. |
| |
| // ignore-pretty FIXME #15189 |
| |
| use std::iter::Unfold; |
| |
| // Unfold had a bug with 'a that mean it didn't work |
| // cross-crate |
| |
| pub fn main() { |
| fn count(st: &mut uint) -> Option<uint> { |
| if *st < 10 { |
| let ret = Some(*st); |
| *st += 1; |
| ret |
| } else { |
| None |
| } |
| } |
| |
| let mut it = Unfold::new(0, count); |
| let mut i = 0; |
| for counted in it { |
| assert_eq!(counted, i); |
| i += 1; |
| } |
| assert_eq!(i, 10); |
| } |
