src/test/ui/run-pass/issues/issue-2989.rs

   1 // Copyright 2012 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 // run-pass
  12 #![allow(non_camel_case_types)]
  13
  14 trait methods {
  15     fn to_bytes(&self) -> Vec<u8> ;
  16 }
  17
  18 impl methods for () {
  19     fn to_bytes(&self) -> Vec<u8> {
  20         Vec::new()
  21     }
  22 }
  23
  24 // the position of this function is significant! - if it comes before methods
  25 // then it works, if it comes after it then it doesn't!
  26 fn to_bools(bitv: Storage) -> Vec<bool> {
  27     (0..8).map(|i| {
  28         let w = i / 64;
  29         let b = i % 64;
  30         let x = 1 & (bitv.storage[w] >> b);
  31         x == 1
  32     }).collect()
  33 }
  34
  35 struct Storage { storage: Vec<u64> }
  36
  37 pub fn main() {
  38     let bools = vec![false, false, true, false, false, true, true, false];
  39     let bools2 = to_bools(Storage{storage: vec![0b01100100]});
  40
  41     for i in 0..8 {
  42         println!("{} => {} vs {}", i, bools[i], bools2[i]);
  43     }
  44
  45     assert_eq!(bools, bools2);
  46 }