1 // Copyright 2014 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 // Test cleanup of rvalue temporary that occurs while `box` construction
12 // is in progress. This scenario revealed a rather terrible bug. The
15 // 1. Partial cleanup of `box` is in scope,
16 // 2. cleanup of return value from `get_bar()` is in scope,
19 // This led to a bug because `the top-most frame that was to be
20 // cleaned (which happens to be the partial cleanup of `box`) required
21 // multiple basic blocks, which led to us dropping part of the cleanup
22 // from the top-most frame.
24 // It's unclear how likely such a bug is to recur, but it seems like a
25 // scenario worth testing.
27 #![allow(unknown_features)]
28 #![feature(box_syntax)]
36 struct Foo { field: Box<uint> }
38 fn do_it(x: &[uint]) -> Foo {
42 fn get_bar(x: uint) -> Vec<uint> { vec!(x * 2) }
46 let mut y: Vec<Box<_>> = Vec::new();
47 y.push(box Conzabble::Bickwick(do_it(&get_bar(x))));
51 thread::spawn(fails).join();