/guava/guava/src/com/google/common/util/concurrent/CycleDetectingLockFactory.java
try { aboutToAcquire( readWriteLock) ;
aboutToAcquire ( readWriteLock ) ; try {
} finally { lockStateChanged(readWriteLock); } } @Override public boolean tryLock() { <extra_id_0> return super.tryLock(); } finally { lockStateChanged(readWriteLock); } } @Override