message: SmallSet::contains_hashed
  Summary: Needed later, also for consistency.
diff: @@ -312,6 +312,16 @@ impl<T> SmallSet<T> {
  self.0.contains_key(key)
  }
  + /// Check if the set contains an element.
  + #[inline]
  + pub fn contains_hashed<Q>(&self, key: Hashed<&Q>) -> bool
  + where
  + Q: Equivalent<T> + ?Sized,
  + T: Eq,
  + {
  + self.0.contains_key_hashed(key)
  + }
  +
  /// Remove all elements from the set.
  ///
  /// Retain the capacity.
  