tests/ui/unsafe/ranged_ints3_const.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

#![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 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 };
    unsafe { NonZero(Cell::new(1)) }
}