message: Make the tests do what we expected
  Summary: Only tests, so doesn't really matter, but better to be correct.
diff: @@ -304,7 +304,7 @@ mod tests {
  #[test]
  fn many_entries() {
  - let letters = 'a'..'z';
  + let letters = 'a'..='z';
  let entries1 = letters;
  let m1 = entries1.clone().collect::<SmallSet<_>>();
  @@ -315,13 +315,13 @@ mod tests {
  assert_eq!(m1.get(&'!'), None);
  assert_eq!(m1.get_index_of(&'!'), None);
  - let letters = ('a'..'z').rev();
  + let letters = ('a'..='z').rev();
  let entries2 = letters;
  let m2 = entries2.clone().collect::<SmallSet<_>>();
  assert_eq!(m1.is_empty(), false);
  - assert_eq!(m1.len(), 25);
  + assert_eq!(m1.len(), 26);
  assert_eq!(m2.is_empty(), false);
  - assert_eq!(m2.len(), 25);
  + assert_eq!(m2.len(), 26);
  assert_eq!(m1.clone().into_iter().eq(entries1), true);
  assert_eq!(m2.clone().into_iter().eq(entries2), true);
  