File: main.rs

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rustc 1.70.0%2Bdfsg1-9
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#[link(name = "foo", kind = "static")]
extern "C" {
    fn test_start(f: extern "C" fn());
    fn test_end();
}

fn main() {
    unsafe {
        test_start(test_middle);
    }
}

struct A;

impl Drop for A {
    fn drop(&mut self) {}
}

extern "C" fn test_middle() {
    let _a = A;
    foo();
}

fn foo() {
    let _a = A;
    unsafe {
        test_end();
    }
}