| // 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: -Zmir-opt-level=1 |
| |
| #![feature(slice_patterns)] |
| |
| use std::mem; |
| |
| #[derive(Copy, Clone)] |
| enum Never {} |
| |
| union Foo { |
| a: u64, |
| b: Never |
| } |
| |
| fn foo(xs: [(Never, u32); 1]) -> u32 { xs[0].1 } |
| |
| fn bar([(_, x)]: [(Never, u32); 1]) -> u32 { x } |
| |
| fn main() { |
| println!("{}", mem::size_of::<Foo>()); |
| |
| let f = [Foo { a: 42 }, Foo { a: 10 }]; |
| println!("{:?}", unsafe { f[0].a }); |
| } |
