Output enter_0 =
      ops::internal::Enter(root.WithOpName("enter_0"), a, "frame_0");
  Output exit_0 = ops::internal::Exit(root.WithOpName("exit_0"), enter_0);
  Output enter_1 =
      ops::internal::Enter(root.WithOpName("enter_1"), a, "frame_1");
  Output exit_1 = ops::internal::Exit(root.WithOpName("exit_1"), enter_1);
  Output b = ops::Add(root.WithOpName("b"), a, exit_1);

      }
    };
  }

  /** Enters this monitor. Blocks indefinitely. */
  public void enter() {
    lock.lock();
  }

  /**
   * Enters this monitor. Blocks at most the given time.
   *
   * @return whether the monitor was entered
   * @since 28.0
   */
  public boolean enter(Duration time) {
    return enter(toNanosSaturated(time), TimeUnit.NANOSECONDS);
  }

  /**

    this.lock = new ReentrantLock(fair);
  }

  /** Enters this monitor. Blocks indefinitely. */
  public void enter() {
    lock.lock();
  }

  /**
   * Enters this monitor. Blocks at most the given time.
   *
   * @return whether the monitor was entered
   */
  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
  public boolean enter(long time, TimeUnit unit) {

    auto enter =
        ops::internal::Enter(scope.WithOpName("while/Enter"), source, "aloop");
    // Add an unused Enter node. These should be ignored.
    auto enter2 =
        ops::internal::Enter(scope.WithOpName("while/Enter2"), source, "aloop");
    auto merge = ops::Merge(scope.WithOpName("while/Merge"),
                            std::initializer_list<Input>{enter, dummy});
    auto ten = ops::Const<int32>(

   * methods that do not take an explicit timeout value, a single test case is generated only if the
   * implicit timeout of that method matches the given timeoutsToUse. For example, enter() is
   * treated like enter(MAX, MILLIS) and tryEnter() is treated like enter(0, MILLIS).
   */
  private static void addTests(
      TestSuite suite,
      Method method,
      Scenario scenario,
      TimeoutsToUse timeoutsToUse,

   * methods that do not take an explicit timeout value, a single test case is generated only if the
   * implicit timeout of that method matches the given timeoutsToUse. For example, enter() is
   * treated like enter(MAX, MILLIS) and tryEnter() is treated like enter(0, MILLIS).
   */
  private static void addTests(
      TestSuite suite,
      Method method,
      Scenario scenario,
      TimeoutsToUse timeoutsToUse,

   */
  public abstract static class Listener {
    /**
     * Called when the service initially becomes healthy.
     *
     * <p>This will be called at most once after all the services have entered the {@linkplain
     * State#RUNNING running} state. If any services fail during start up or {@linkplain
     * State#FAILED fail}/{@linkplain State#TERMINATED terminate} before all other services have

   */
  public abstract static class Listener {
    /**
     * Called when the service initially becomes healthy.
     *
     * <p>This will be called at most once after all the services have entered the {@linkplain
     * State#RUNNING running} state. If any services fail during start up or {@linkplain
     * State#FAILED fail}/{@linkplain State#TERMINATED terminate} before all other services have

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * This class keeps track of all objects being evaluated at the moment.
 * It helps to provide nicer error messages when the evaluation enters an endless cycle (A obtains a value of B which obtains a value of A).
 * <p>
 * Concurrent evaluation of same objects by multiple threads is still allowed.
 * <p>

			switch state {
			case entered:
				if new == trace.GoWaiting {
					state = blocked
				} else {
					state = entered
				}
			case blocked:
				if new == trace.GoRunnable {
					state = runnable
				} else {
					state = entered
				}
			case runnable:
				if new == trace.GoRunning {
					state = running
				} else {
					state = entered
				}
			case running: