/guava/guava/src/com/google/common/collect/Sets.java
return super.retainAll( retainAll( c) ) ;
return super.retainAll ( checkNotNull ( c ) ) ;
@Override public boolean removeAll(Collection<?> c) { return removeAllImpl(this, c); } @Override public boolean retainAll(Collection<?> c) { <extra_id_0> } } @GwtCompatible(serializable = true) public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet( E anElement, E... otherElements) { return ImmutableEnumSet.asImmutable(EnumSet.of(anElement, otherElements));