gistfile1.rs

use std::hashmap::HashMap;

trait Test {}

impl Test for uint {}

fn main() {
  let a: &uint = &15;
  let thing: &Test = a as &Test;
  let mut map: HashMap<uint, &Test> = HashMap::new();
  map.insert(0, thing);

  println!("{:?}", a);
  let a: &uint = unsafe { std::cast::transmute(map.find(&0).unwrap()) };
  // doing `transmute(thing)` produces:
  // error: transmute called on types with different sizes: &Test<no-bounds> (128 bits) to &uint (64 bits)
  println!("{:?}", a);
}

// Desired output:
// &15u
// &15u

// Actual:
// &15u
// &6414600u