mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-07 06:04:32 +00:00
30 lines
778 B
Rust
30 lines
778 B
Rust
// revisions: mirunsafeck thirunsafeck
|
|
// [thirunsafeck]compile-flags: -Z thir-unsafeck
|
|
|
|
#![feature(rustc_attrs)]
|
|
|
|
#[rustc_layout_scalar_valid_range_start(1)]
|
|
#[repr(transparent)]
|
|
pub(crate) struct NonZero<T>(pub(crate) T);
|
|
fn main() {
|
|
}
|
|
|
|
const fn foo() -> NonZero<u32> {
|
|
let mut x = unsafe { NonZero(1) };
|
|
let y = &mut x.0; //~ ERROR mutable references
|
|
//~^ ERROR mutation of layout constrained field is unsafe
|
|
unsafe { NonZero(1) }
|
|
}
|
|
|
|
const fn bar() -> NonZero<u32> {
|
|
let mut x = unsafe { NonZero(1) };
|
|
let y = unsafe { &mut x.0 }; //~ ERROR mutable references
|
|
unsafe { NonZero(1) }
|
|
}
|
|
|
|
const fn boo() -> NonZero<u32> {
|
|
let mut x = unsafe { NonZero(1) };
|
|
unsafe { let y = &mut x.0; } //~ ERROR mutable references
|
|
unsafe { NonZero(1) }
|
|
}
|