rustfmt-nightly 1.4.21

Tool to find and fix Rust formatting issues
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fn a<F>(_f: F) -> ()
where
    F: FnOnce() -> (),
{
}
fn main() {
    a(|| {
        #[allow(irrefutable_let_patterns)]
        while let _ = 0 {
            break;
        }
    });
}