/guava/guava/src/com/google/common/collect/ForwardingNavigableMap.java
return delegate ( ) .subMap ( fromKey, fromInclusive, toKey, toInclusive ) ;
@Override public NavigableMap<K, V> subMap( @ParametricNullness K fromKey, boolean fromInclusive, @ParametricNullness K toKey, boolean toInclusive) { <extra_id_0> } @Override public NavigableMap<K, V> headMap(@ParametricNullness K toKey, boolean inclusive) { return delegate().headMap(toKey, inclusive); } @Override