1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![feature(generators, generator_trait, box_leak)]
13 use std::cell::RefCell;
14 use std::ops::Generator;
18 cell = Box::new(RefCell::new(0));
19 let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
20 //~^ ERROR `*cell` does not live long enough [E0597]
21 // the upvar is the non-dropck `&mut Option<Ref<'a, i32>>`.
23 // but the generator can use it to drop a `Ref<'a, i32>`.
24 let _d = ref_.take(); //~ ERROR `ref_` does not live long enough
27 unsafe { gen.resume(); }
28 // drops the RefCell and then the Ref, leading to use-after-free