Add dropck test
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src/test/ui/generator/dropck.rs
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src/test/ui/generator/dropck.rs
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(generators, generator_trait, box_leak)]
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use std::cell::RefCell;
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use std::ops::Generator;
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fn main() {
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let (cell, mut gen);
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cell = Box::new(RefCell::new(0));
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let ref_ = Box::leak(Box::new(Some(cell.borrow_mut())));
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// the upvar is the non-dropck `&mut Option<Ref<'a, i32>>`.
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gen = || {
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// but the generator can use it to drop a `Ref<'a, i32>`.
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let _d = ref_.take(); //~ ERROR `ref_` does not live long enough
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yield;
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};
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gen.resume();
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// drops the RefCell and then the Ref, leading to use-after-free
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}
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src/test/ui/generator/dropck.stderr
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src/test/ui/generator/dropck.stderr
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error[E0597]: `ref_` does not live long enough
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--> $DIR/dropck.rs:23:18
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21 | gen = || {
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| -- capture occurs here
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22 | // but the generator can use it to drop a `Ref<'a, i32>`.
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23 | let _d = ref_.take(); //~ ERROR `ref_` does not live long enough
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| ^^^^ borrowed value does not live long enough
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...
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28 | }
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| - borrowed value dropped before borrower
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= note: values in a scope are dropped in the opposite order they are created
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error: aborting due to previous error
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