/guava/guava/src/com/google/common/collect/TreeRangeMap.java
return SubRangeMapAsMap.this.remove ( o ) != null;
} @Override public Set<Range<K>> keySet() { return new Maps.KeySet<Range<K>, V>(SubRangeMapAsMap.this) { @Override public boolean remove(@CheckForNull Object o) { <extra_id_0> } @Override public boolean retainAll(Collection<?> c) { return removeEntryIf(compose(not(in(c)), Maps.<Range<K>>keyFunction())); } };