rust/src/test/run-pass/issue-2735-3.rs

// Copyright 2012 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.

#![feature(unsafe_destructor)]

use std::cell::Cell;
use std::gc::{Gc, GC};

// This test should behave exactly like issue-2735-2
struct defer {
    b: Gc<Cell<bool>>,
}

#[unsafe_destructor]
impl Drop for defer {
    fn drop(&mut self) {
        self.b.set(true);
    }
}

fn defer(b: Gc<Cell<bool>>) -> defer {
    defer {
        b: b
    }
}

pub fn main() {
    let dtor_ran = box(GC) Cell::new(false);
    defer(dtor_ran);
    assert!(dtor_ran.get());
}