| // 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)] |
| pub struct Good { |
| data: &'static u32, |
| data2: [&'static u32; 2], |
| aligned: [u8; 32], |
| } |
| |
| #[repr(packed)] |
| pub struct JustArray { |
| array: [u32] |
| } |
| |
| #[deny(safe_packed_borrows)] |
| fn main() { |
| let good = Good { |
| data: &0, |
| data2: [&0, &0], |
| aligned: [0; 32] |
| }; |
| |
| unsafe { |
| let _ = &good.data; // ok |
| let _ = &good.data2[0]; // ok |
| } |
| |
| let _ = &good.data; //~ ERROR borrow of packed field is unsafe |
| //~| hard error |
| let _ = &good.data2[0]; //~ ERROR borrow of packed field is unsafe |
| //~| hard error |
| let _ = &*good.data; // ok, behind a pointer |
| let _ = &good.aligned; // ok, has align 1 |
| let _ = &good.aligned[2]; // ok, has align 1 |
| } |