import com.google.common.base.MoreObjects;
import com.google.common.base.MoreObjects.ToStringHelper;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
// All access needs to go through this handle
@SuppressWarnings("unused")
+ @SuppressFBWarnings(value = "UUF_UNUSED_FIELD", justification = "https://github.com/spotbugs/spotbugs/issues/2749")
private volatile byte closed;
static {