File: lib.rs

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rustc 1.70.0%2Bdfsg1-9
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#![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();
}