@Override
        public void reportLeak(SharedReference<Object> reference, @Nullable Throwable stacktrace) {
          final Object ref = reference.get();
          FLog.w(
              TAG,
              "Finalized without closing: %x %x (type = %s)",
              System.identityHashCode(this),
              System.identityHashCode(reference),
              ref == null ? null : ref.getClass().getName());
        }
Indicate whether the {@link #reportLeak(SharedReference, Throwable)} method expects a
stacktrace. This is expensive and should only be used sparingly.
fbcore/src/main/java/com/facebook/common/references/CloseableReference.java