1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
// Copyright 2013 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.
/*!
* On x86_64-linux-gnu and possibly other platforms, structs get 8-byte "preferred" alignment,
* but their "ABI" alignment (i.e., what actually matters for data layout) is the largest alignment
* of any field. (Also, u64 has 8-byte ABI alignment; this is not always true).
*
* On such platforms, if monomorphize uses the "preferred" alignment, then it will unify
* `A` and `B`, even though `S<A>` and `S<B>` have the field `t` at different offsets,
* and apply the wrong instance of the method `unwrap`.
*/
struct S<T> { i:u8, t:T }
impl<T> S<T> { fn unwrap(self) -> T { self.t } }
struct A((u32, u32));
struct B(u64);
pub fn main() {
static Ca: S<A> = S { i: 0, t: A((13, 104)) };
static Cb: S<B> = S { i: 0, t: B(31337) };
assert_eq!(*(Ca.unwrap()), (13, 104));
assert_eq!(*(Cb.unwrap()), 31337);
}
|
