| // Copyright 2017 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. |
| |
| // compile-flags: -O |
| #![crate_type="lib"] |
| #![feature(maybe_uninit)] |
| |
| use std::mem::MaybeUninit; |
| |
| // Boxing a `MaybeUninit` value should not copy junk from the stack |
| #[no_mangle] |
| pub fn box_uninitialized() -> Box<MaybeUninit<usize>> { |
| // CHECK-LABEL: @box_uninitialized |
| // CHECK-NOT: store |
| Box::new(MaybeUninit::uninitialized()) |
| } |
