blob: 992a31a73208345779eb4184de190d1e42a1fba5 [file] [log] [blame]
// Copyright 2018 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(generators, generator_trait, box_leak)]
use std::cell::RefCell;
use std::ops::Generator;
fn main() {
let (mut gen, cell);
cell = Box::new(RefCell::new(0));
let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
//~^ ERROR `*cell` does not live long enough [E0597]
// the upvar is the non-dropck `&mut Option<Ref<'a, i32>>`.
gen = || {
// but the generator can use it to drop a `Ref<'a, i32>`.
let _d = ref_.take(); //~ ERROR `ref_` does not live long enough
yield;
};
unsafe { gen.resume(); }
// drops the RefCell and then the Ref, leading to use-after-free
}