private void testSupplierThreadSafe(Function<Supplier<Boolean>, Supplier<Boolean>> memoizer)
      throws Throwable {
    final AtomicInteger count = new AtomicInteger(0);
    final AtomicReference<Throwable> thrown = new AtomicReference<>(null);
    final int numThreads = 3;
    final Thread[] threads = new Thread[numThreads];
    final long timeout = TimeUnit.SECONDS.toNanos(60);

    final Supplier<Boolean> supplier =

    return new ExecutionSequencer();
  }

  /** This reference acts as a pointer tracking the head of a linked list of ListenableFutures. */
  private final AtomicReference<ListenableFuture<@Nullable Void>> ref =
      new AtomicReference<>(immediateVoidFuture());

  private @LazyInit ThreadConfinedTaskQueue latestTaskQueue = new ThreadConfinedTaskQueue();

  /**

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Unit test for {@link AbstractScheduledService}.
 *
 * @author Luke Sandberg
 */

                        ModelProblemUtils.toSourceHint(childModel)));

        ModelSource modelSource;
        try {
            AtomicReference<Parent> modified = new AtomicReference<>();
            Session session = request.getSession()
                    .withRemoteRepositories(request.getModelRepositoryHolder().getRepositories());

                + 1); // for the main thread
    final ExecutorService executor = Executors.newFixedThreadPool(barrier.getParties());
    final AtomicReference<AbstractFuture<String>> currentFuture = Atomics.newReference();
    final AtomicReference<AbstractFuture<String>> setFutureFuture = Atomics.newReference();
    final AtomicBoolean setFutureSetSuccess = new AtomicBoolean();

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;

/**

                + 1); // for the main thread
    final ExecutorService executor = Executors.newFixedThreadPool(barrier.getParties());
    final AtomicReference<AbstractFuture<String>> currentFuture = Atomics.newReference();
    final AtomicReference<AbstractFuture<String>> setFutureFuture = Atomics.newReference();
    final AtomicBoolean setFutureSetSuccess = new AtomicBoolean();

    return (type instanceof Class) ? ((Class<?>) type).getName() : type.toString();
  }

  @CheckForNull
  static Type getComponentType(Type type) {
    checkNotNull(type);
    AtomicReference<@Nullable Type> result = new AtomicReference<>();
    new TypeVisitor() {
      @Override
      void visitTypeVariable(TypeVariable<?> t) {
        result.set(subtypeOfComponentType(t.getBounds()));
      }

      @Override

    final ClosingFuture<Object> input2Failed = failedClosingFuture();
    final ClosingFuture<String> nonInput = ClosingFuture.from(immediateFuture("value3"));
    final AtomicReference<ClosingFuture.Peeker> capturedPeeker = new AtomicReference<>();
    ClosingFuture<TestCloseable> closingFuture =
        ClosingFuture.whenAllComplete(ImmutableList.of(input1, input2Failed))
            .call(

    final ClosingFuture<Object> input2Failed = failedClosingFuture();
    final ClosingFuture<String> nonInput = ClosingFuture.from(immediateFuture("value3"));
    final AtomicReference<ClosingFuture.Peeker> capturedPeeker = new AtomicReference<>();
    ClosingFuture<TestCloseable> closingFuture =
        ClosingFuture.whenAllComplete(ImmutableList.of(input1, input2Failed))
            .call(