| // 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. |
| |
| #[repr(packed)] |
| #[derive(Copy, Clone)] |
| struct Packed<T>(T); |
| |
| fn main() { |
| let one = (Some(Packed((&(), 0))), true); |
| let two = [one, one]; |
| let stride = (&two[1] as *const _ as usize) - (&two[0] as *const _ as usize); |
| |
| // This can fail if rustc and LLVM disagree on the size of a type. |
| // In this case, `Option<Packed<(&(), u32)>>` was erronously not |
| // marked as packed despite needing alignment `1` and containing |
| // its `&()` discriminant, which has alignment larger than `1`. |
| assert_eq!(stride, std::mem::size_of_val(&one)); |
| } |
