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1 | // Copyright 2017 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. | |
4 | // | |
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. | |
10 | ||
11 | #[repr(packed)] | |
12 | pub struct Good { | |
13 | data: &'static u32, | |
14 | data2: [&'static u32; 2], | |
15 | aligned: [u8; 32], | |
16 | } | |
17 | ||
18 | #[repr(packed)] | |
19 | pub struct JustArray { | |
20 | array: [u32] | |
21 | } | |
22 | ||
23 | #[deny(safe_packed_borrows)] | |
24 | fn main() { | |
25 | let good = Good { | |
26 | data: &0, | |
27 | data2: [&0, &0], | |
28 | aligned: [0; 32] | |
29 | }; | |
30 | ||
31 | unsafe { | |
32 | let _ = &good.data; // ok | |
33 | let _ = &good.data2[0]; // ok | |
34 | } | |
35 | ||
36 | let _ = &good.data; //~ ERROR borrow of packed field requires unsafe | |
37 | //~| hard error | |
38 | let _ = &good.data2[0]; //~ ERROR borrow of packed field requires unsafe | |
39 | //~| hard error | |
40 | let _ = &*good.data; // ok, behind a pointer | |
41 | let _ = &good.aligned; // ok, has align 1 | |
42 | let _ = &good.aligned[2]; // ok, has align 1 | |
43 | } |