src/test/ui/unsafe/ranged_ints.rs

#![feature(rustc_attrs)]

#[rustc_layout_scalar_valid_range_start(1)]
#[repr(transparent)]
pub(crate) struct NonZero<T>(pub(crate) T);
fn main() {
    let _x = NonZero(0); //~ ERROR initializing type with `rustc_layout_scalar_valid_range` attr
}