// TF_Graph may only / must be deleted when
  //   sessions.size() == 0 && delete_requested == true
  //
  // TODO(b/74949947): mutations currently trigger a warning instead of a bad
  // status, this should be reverted when possible.
  tensorflow::gtl::FlatMap<TF_Session*, tensorflow::string> sessions
      TF_GUARDED_BY(mu);
  bool delete_requested TF_GUARDED_BY(mu);  // set true by TF_DeleteGraph

    assertEquals(GeneralRange.all(ORDERING.reverse()), GeneralRange.all(ORDERING).reverse());
    assertEquals(
        GeneralRange.downTo(ORDERING.reverse(), 3, CLOSED),
        GeneralRange.upTo(ORDERING, 3, CLOSED).reverse());
    assertEquals(
        GeneralRange.upTo(ORDERING.reverse(), 3, OPEN),
        GeneralRange.downTo(ORDERING, 3, OPEN).reverse());
    assertEquals(

  }

  @GwtIncompatible // stringConverter
  public void testStringConverter_reverse() {
    Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
    assertEquals("CHEETO", converter.reverse().convert(TestEnum.CHEETO));
    assertEquals("HONDA", converter.reverse().convert(TestEnum.HONDA));
    assertEquals("POODLE", converter.reverse().convert(TestEnum.POODLE));
  }

  @J2ktIncompatible

    MutableGraph<Integer> graph =
        GraphBuilder.directed()
            .nodeOrder(ElementOrder.sorted(Ordering.<Integer>natural().reverse()))
            .build();

    addNodes(graph);

    assertThat(graph.nodeOrder())
        .isEqualTo(ElementOrder.sorted(Ordering.<Integer>natural().reverse()));
    assertThat(graph.nodes()).containsExactly(4, 3, 1).inOrder();
  }

  // Edge order tests

  @Test

      SampleElements<Entry<K, V>> samples = generator.samples();
      return new SampleElements<>(
          reverse(samples.e0()),
          reverse(samples.e1()),
          reverse(samples.e2()),
          reverse(samples.e3()),
          reverse(samples.e4()));
    }

    private Entry<V, K> reverse(Entry<K, V> entry) {
      return Helpers.mapEntry(entry.getValue(), entry.getKey());
    }

    assertEquals(GeneralRange.all(ORDERING.reverse()), GeneralRange.all(ORDERING).reverse());
    assertEquals(
        GeneralRange.downTo(ORDERING.reverse(), 3, CLOSED),
        GeneralRange.upTo(ORDERING, 3, CLOSED).reverse());
    assertEquals(
        GeneralRange.upTo(ORDERING.reverse(), 3, OPEN),
        GeneralRange.downTo(ORDERING, 3, OPEN).reverse());
    assertEquals(

            }
        }

        boolean reverse = false;

        if (jdk.startsWith("!")) {
            reverse = true;
            jdk = jdk.substring(1);
        }

        if (getJdkVersion().startsWith(jdk)) {
            return !reverse;
        } else {
            return reverse;
        }
    }

      SampleElements<Entry<K, V>> samples = generator.samples();
      return new SampleElements<>(
          reverse(samples.e0()),
          reverse(samples.e1()),
          reverse(samples.e2()),
          reverse(samples.e3()),
          reverse(samples.e4()));
    }

    private Entry<V, K> reverse(Entry<K, V> entry) {
      return Helpers.mapEntry(entry.getValue(), entry.getKey());
    }

    MutableGraph<Integer> graph =
        GraphBuilder.directed()
            .nodeOrder(ElementOrder.sorted(Ordering.<Integer>natural().reverse()))
            .build();

    addNodes(graph);

    assertThat(graph.nodeOrder())
        .isEqualTo(ElementOrder.sorted(Ordering.<Integer>natural().reverse()));
    assertThat(graph.nodes()).containsExactly(4, 3, 1).inOrder();
  }

  // Edge order tests

  @Test

  }

  @Override
  @SuppressWarnings("nullness") // should be safe, but not sure if we can avoid the warning
  public <S extends @Nullable T> Ordering<S> reverse() {
    // ordering.reverse() might be optimized, so let it do its thing
    return ordering.<T>reverse().<@NonNull S>nullsLast();
  }

  @SuppressWarnings("unchecked") // still need the right way to explain this
  @Override