src/test/run-pass/unfold-cross-crate.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(core)]
  12
  13 use std::iter::Unfold;
  14
  15 // Unfold had a bug with 'a that mean it didn't work
  16 // cross-crate
  17
  18 pub fn main() {
  19     fn count(st: &mut usize) -> Option<usize> {
  20         if *st < 10 {
  21             let ret = Some(*st);
  22             *st += 1;
  23             ret
  24         } else {
  25             None
  26         }
  27     }
  28
  29     let mut it = Unfold::new(0, count);
  30     let mut i = 0;
  31     for counted in it {
  32         assert_eq!(counted, i);
  33         i += 1;
  34     }
  35     assert_eq!(i, 10);
  36 }