rust/tests/compile-fail/validity/dangling_ref1.rs

// Make sure we catch this even without Stacked Borrows
// compile-flags: -Zmiri-disable-stacked-borrows
use std::mem;

fn main() {
    let _x: &i32 = unsafe { mem::transmute(16usize) }; //~ ERROR encountered a dangling reference (address $HEX is unallocated)
}