/guava/android/guava/src/com/google/common/io/CharSource.java
if ( !( lengthIfKnown.isPresent( ) ) ) {   return absent( ) ; }
[Delete]
@Override public Optional<Long> lengthIfKnown() { long result = 0L; for (CharSource source : sources) { Optional<Long> lengthIfKnown = source.lengthIfKnown(); if (!lengthIfKnown.isPresent()) { <extra_id_0> } result += lengthIfKnown.get(); } return Optional.of(result); } @Override