mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 09:14:20 +00:00
22 lines
676 B
Rust
22 lines
676 B
Rust
#![feature(rustc_attrs)]
|
|
|
|
use std::cell::Cell;
|
|
|
|
#[rustc_layout_scalar_valid_range_start(1)]
|
|
#[repr(transparent)]
|
|
pub(crate) struct NonZero<T>(pub(crate) T);
|
|
fn main() {}
|
|
|
|
const fn foo() -> NonZero<Cell<u32>> {
|
|
let mut x = unsafe { NonZero(Cell::new(1)) };
|
|
let y = &x.0; //~ ERROR the borrowed element may contain interior mutability
|
|
//~^ ERROR borrow of layout constrained field with interior mutability
|
|
unsafe { NonZero(Cell::new(1)) }
|
|
}
|
|
|
|
const fn bar() -> NonZero<Cell<u32>> {
|
|
let mut x = unsafe { NonZero(Cell::new(1)) };
|
|
let y = unsafe { &x.0 }; //~ ERROR the borrowed element may contain interior mutability
|
|
unsafe { NonZero(Cell::new(1)) }
|
|
}
|