1 // Copyright 2018 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.
18 let mut x: (Void, usize);
22 // Make sure `y` stays on the stack.
23 test::black_box(&mut y);
25 // Check that the write to `x.1` did not overwrite `y`.
26 // Note that this doesn't fail with optimizations enabled,
27 // because we can't keep `x.1` on the stack, like we can `y`,
28 // as we can't borrow partially initialized variables.
29 assert_eq!(y.to_string(), "42");
31 // Check that `(Void, usize)` has space for the `usize` field.
32 assert_eq!(std::mem::size_of::<(Void, usize)>(),
33 std::mem::size_of::<usize>());