File: box-fnonce.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ run-pass

fn call_it<T>(f: Box<dyn FnOnce() -> T>) -> T {
    f()
}

fn main() {
    let s = "hello".to_owned();
    assert_eq!(&call_it(Box::new(|| s)) as &str, "hello");
}