rust/tests/compile-fail/stacked_borrows/illegal_write2.rs

fn main() {
    let target = &mut 42;
    let target2 = target as *mut _;
    drop(&mut *target); // reborrow
    // Now make sure our ref is still the only one.
    unsafe { *target2 = 13; } //~ ERROR does not exist on the borrow stack
    let _val = *target;
}