The key problem is how to handle error inside a closure that retruns ().

#[allow(clippy::unwrap_used)]
pub fn backup_newest_in<V: AsRef<[DirEntry]>>(v: V) -> anyhow::Result<()> {
    let mut v = v.as_ref().to_owned();
    if v.is_empty() {
        return Err(anyhow::anyhow!("nothing to backup"));
    }
    //here
    v.sort_by_key(|d: &DirEntry| d.metadata().unwrap().modified().unwrap());
    todo!()
}

can we handle this without unwrap()?

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