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              @Override
              public ListenableFuture<@Nullable Void> call() {
                return settableFuture;
              }
            },
            directExecutor()));
    for (int i = 0; i < 50_000; i++) {
      results.add(serializer.submit(Callables.<Void>returning(null), directExecutor()));
    }
    settableFuture.set(null);
    getDone(allAsList(results));
  }

              @Override
              public ListenableFuture<@Nullable Void> call() {
                return settableFuture;
              }
            },
            directExecutor()));
    for (int i = 0; i < 50_000; i++) {
      results.add(serializer.submit(Callables.<Void>returning(null), directExecutor()));
    }
    settableFuture.set(null);
    getDone(allAsList(results));
  }

      Integer element = random.nextInt();
      control.add(element);
      assertTrue(q.add(element));
    }
    assertIntact(q);
    for (int i = 0; i < reduceIterationsIfGwt(500_000); i++) {
      if (random.nextBoolean()) {
        Integer element = random.nextInt();
        control.add(element);
        q.add(element);
      } else {