}

  static class MyError extends Error {}

  static class MyRuntimeException extends RuntimeException {}

  /**
   * Test that the function is invoked only once, even if it throws an exception. Also, test that
   * that function's result is wrapped in an ExecutionException.
   */
  @J2ktIncompatible
  @GwtIncompatible // reflection

  }

  static class MyError extends Error {}

  static class MyRuntimeException extends RuntimeException {}

  /**
   * Test that the function is invoked only once, even if it throws an exception. Also, test that
   * that function's result is wrapped in an ExecutionException.
   */
  @J2ktIncompatible
  @GwtIncompatible // reflection

  }

  // Queues

  /**
   * A custom queue for managing eviction order. Note that this is tightly integrated with {@code
   * ReferenceEntry}, upon which it relies to perform its linking.
   *
   * <p>Note that this entire implementation makes the assumption that all elements which are in the
   * map are also in this queue, and that all elements not in the queue are not in the map.
   *

      assertThat(cache.getOrLoad("test")).isEqualTo("testLoad");

      ticker.advance(10, MILLISECONDS); // so that the next call will trigger refresh
      assertThat(cache.getOrLoad("test")).isEqualTo("testLoad");
      reloadStarted.await();
      ticker.advance(500, MILLISECONDS); // so that the entry expires during the reload
      threadAboutToBlockForRefresh.set(Thread.currentThread());

      assertThat(cache.getOrLoad("test")).isEqualTo("testLoad");

      ticker.advance(10, MILLISECONDS); // so that the next call will trigger refresh
      assertThat(cache.getOrLoad("test")).isEqualTo("testLoad");
      reloadStarted.await();
      ticker.advance(500, MILLISECONDS); // so that the entry expires during the reload
      threadAboutToBlockForRefresh.set(Thread.currentThread());

         * That could change behavior if the input maps use different equivalence relations (and so
         * a key that appears once in `right` might appear multiple times in `left`). We don't
         * guarantee behavior in that case, anyway, and the current behavior is likely undesirable.
         * So that's either a reason to feel free to change it or a reason to not bother thinking

   *     begins. Consider replacing code that creates {@link ListenableFuture}s of closeable types,
   *     including those that pass them to this method, with {@link #submit(ClosingCallable,
   *     Executor)} in order to ensure that resources do not leak. Or, to start a pipeline with a
   *     {@link ListenableFuture} that doesn't create values that should be closed, use {@link
   *     ClosingFuture#from}.
   */

  }

  // Queues

  /**
   * A custom queue for managing eviction order. Note that this is tightly integrated with {@code
   * ReferenceEntry}, upon which it relies to perform its linking.
   *
   * <p>Note that this entire implementation makes the assumption that all elements which are in the
   * map are also in this queue, and that all elements not in the queue are not in the map.
   *