File: sendfn-is-a-block.rs

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rustc 1.86.0%2Bdfsg1-1
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//@ run-pass

fn test<F>(f: F) -> usize
where
    F: FnOnce(usize) -> usize,
{
    return f(22);
}

pub fn main() {
    let y = test(|x| 4 * x);
    assert_eq!(y, 88);
}