src/tools/miri/tests/fail/tree_borrows/strongly-protected.rs

//@compile-flags: -Zmiri-tree-borrows
//@error-in-other-file: /deallocation through .* is forbidden/

fn inner(x: &mut i32, f: fn(*mut i32)) {
    // `f` may mutate, but it may not deallocate!
    // `f` takes a raw pointer so that the only protector
    // is that on `x`
    f(x)
}

fn main() {
    inner(Box::leak(Box::new(0)), |raw| {
        drop(unsafe { Box::from_raw(raw) });
    });
}