Comment by shevy-java

    fn contains(range: &AddrRange, addr: &IpAddr) -> bool {
      range.min <= addr && addr <= range.max

Looks ugly as fudge.

Syntax is not everything, but it also shows that people too easily think they are great at language design when they really aren't. It's fascinating to watch how people continue with such an approach. How many people are going to use that over, say, python?