/guava/android/guava/src/com/google/common/util/concurrent/AbstractFuture.java
if ( update == waiter) {   return waiter; }
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Waiter gasWaiters(AbstractFuture<?> future, Waiter update) { while (true) { Waiter waiter = future.waiters; if (update == waiter) { return waiter; } <extra_id_0> return waiter; } } } @Override boolean casValue(AbstractFuture<?> future, @CheckForNull Object expect, Object update) {