Sort a vector of floats

fn main() {
  let mut vec = vec![1.1, 1.15, 5.5, 1.123, 2.0];
  vec.sort_by(|a, b| a.partial_cmp(b).unwrap());
  assert_eq!(vec, vec![1.1, 1.123, 1.15, 2.0, 5.5]);
}