rust/tests/ui/consts/const-eval/ref_to_int_match.rs

//@ stderr-per-bitwidth

fn main() {
    let n: Int = 40;
    match n {
        0..=10 => {}
        10..=BAR => {} // ok, `const` error already emitted
        _ => {}
    }
}

#[repr(C)]
union Foo {
    f: Int,
    r: &'static u32,
}

#[cfg(target_pointer_width = "64")]
type Int = u64;

#[cfg(target_pointer_width = "32")]
type Int = u32;

const BAR: Int = unsafe { Foo { r: &42 }.f };
//~^ ERROR unable to turn pointer into integer