File: use-foo.rs

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rustc 1.70.0%2Bdfsg1-9
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#![feature(extern_types)]

extern "C" {
    type Foo;
    static FOO: Foo;
    fn bar(foo: *const Foo) -> u8;
}

fn main() {
    unsafe {
        let foo = &FOO;
        assert_eq!(bar(foo), 42);
    }
}