/guava/guava/src/com/google/common/collect/Synchronized.java
return sortedSet( delegate( ).tailSet( fromElement) , 0) ;
return sortedSet ( delegate ( ) .tailSet ( fromElement ) , mutex ) ;
return sortedSet(delegate().headSet(toElement), mutex); } } @Override public SortedSet<E> tailSet(E fromElement) { synchronized (mutex) { <extra_id_0> } } @Override public E first() { synchronized (mutex) { return delegate().first();