| // Copyright 2014 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. |
| |
| // Test cleanup of rvalue temporary that occurs while `box` construction |
| // is in progress. This scenario revealed a rather terrible bug. The |
| // ingredients are: |
| // |
| // 1. Partial cleanup of `box` is in scope, |
| // 2. cleanup of return value from `get_bar()` is in scope, |
| // 3. do_it() panics. |
| // |
| // This led to a bug because `the top-most frame that was to be |
| // cleaned (which happens to be the partial cleanup of `box`) required |
| // multiple basic blocks, which led to us dropping part of the cleanup |
| // from the top-most frame. |
| // |
| // It's unclear how likely such a bug is to recur, but it seems like a |
| // scenario worth testing. |
| |
| // ignore-emscripten no threads support |
| |
| #![allow(unknown_features)] |
| #![feature(box_syntax)] |
| |
| use std::thread; |
| |
| enum Conzabble { |
| Bickwick(Foo) |
| } |
| |
| struct Foo { field: Box<usize> } |
| |
| fn do_it(x: &[usize]) -> Foo { |
| panic!() |
| } |
| |
| fn get_bar(x: usize) -> Vec<usize> { vec!(x * 2) } |
| |
| pub fn fails() { |
| let x = 2; |
| let mut y: Vec<Box<_>> = Vec::new(); |
| y.push(box Conzabble::Bickwick(do_it(&get_bar(x)))); |
| } |
| |
| pub fn main() { |
| thread::spawn(fails).join(); |
| } |