import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.Optional;
// All access needs to go through STATE
@SuppressWarnings("unused")
+ @SuppressFBWarnings(value = "UUF_UNUSED_FIELD", justification = "https://github.com/spotbugs/spotbugs/issues/2749")
private volatile byte state;
InMemoryDataTreeModification(final InMemoryDataTreeSnapshot snapshot,