File: ranged_ints4_const.rs

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rustc 1.87.0%2Bdfsg1-1
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#![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) };
    x.0 = 0;
    //~^ ERROR mutation of layout constrained field is unsafe
    x
}

const fn bar() -> NonZero<u32> {
    let mut x = unsafe { NonZero(1) };
    unsafe { x.0 = 0 }; // this is UB
    x
}