rust/src/test/run-pass/issue-3026.rs

// Copyright 2012-2014 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.

#![allow(unknown_features)]
#![feature(box_syntax)]

extern crate collections;

use std::collections::HashMap;

pub fn main() {
    let x;
    let mut buggy_map: HashMap<uint, &uint> = HashMap::new();
    x = box 1;
    buggy_map.insert(42, &*x);
}