Function range_is_empty

crates/commitlog/src/commitlog.rs:1051–1064

`range_bounds_is_empty` https://github.com/rust-lang/rust/issues/137300 This is correct for integers, but unsound for arbitrary `T`, so unlikely to be stabilized.

(range: &impl RangeBounds<u64>)

// This is correct for integers, but unsound for arbitrary `T`, so unlikely to
// be stabilized.
fn range_is_empty(range: &impl RangeBounds<u64>) -> bool {
    use std::ops::Bound::*;

    #[rustfmt::skip]
    let not_empty = match (range.start_bound(), range.end_bound()) {
        (Unbounded, _) | (_, Unbounded) => true,
        (Included(start), Excluded(end))
        | (Excluded(start), Included(end))
        | (Excluded(start), Excluded(end)) => start < end,
        (Included(start), Included(end)) => start <= end,
    };

    !not_empty
}

#[cfg(test)]
mod tests {