rustc/tests/run-make/static-unwinding/lib.rs

#![crate_type = "rlib"]

pub static mut statik: isize = 0;

struct A;
impl Drop for A {
    fn drop(&mut self) {
        unsafe {
            statik = 1;
        }
    }
}

pub fn callback<F>(f: F)
where
    F: FnOnce(),
{
    let _a = A;
    f();
}