rust/src/test/run-pass-valgrind/cleanup-auto-borrow-obj.rs

// Copyright 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.


// This would previously leak the Box<Trait> because we wouldn't
// schedule cleanups when auto borrowing trait objects.
// This program should be valgrind clean.

#![feature(box_syntax)]

static mut DROP_RAN: bool = false;

struct Foo;
impl Drop for Foo {
    fn drop(&mut self) {
        unsafe { DROP_RAN = true; }
    }
}


trait Trait {}
impl Trait for Foo {}

pub fn main() {
    {
        let _x: &Trait = &*(box Foo as Box<Trait>);
    }
    unsafe {
        assert!(DROP_RAN);
    }
}