private abstract static class RawTypeConsistencyTester<T extends Enum<T> & CharSequence> {
    abstract T returningT();

    abstract void acceptT(T t);

    abstract <X extends T> X returningX();

    abstract <X> void acceptX(X x);

    abstract <T2 extends Enum<T2> & CharSequence> T2 returningT2();

    abstract <T2 extends CharSequence & Iterable<T2>> void acceptT2(T2 t2);

    if (instance != null) {
      return (ListenableFuture<V>) instance;
    }
    return new ImmediateCancelledFuture<>();
  }

  /**
   * Executes {@code callable} on the specified {@code executor}, returning a {@code Future}.
   *
   * @throws RejectedExecutionException if the task cannot be scheduled for execution
   * @since 28.2
   */
  public static <O extends @Nullable Object> ListenableFuture<O> submit(

    return derive(future.transformAsync(applyFunction, executor));
  }

  /**
   * Returns an {@link AsyncClosingFunction} that applies an {@link AsyncFunction} to an input,
   * ignoring the DeferredCloser and returning a {@code ClosingFuture} derived from the returned
   * {@link ListenableFuture}.
   *
   * <p>Use this method to pass a transformation to {@link #transformAsync(AsyncClosingFunction,

      @Override
      T transform(@ParametricNullness F from) {
        return function.apply(from);
      }
    };
  }

  /**
   * Advances {@code iterator} {@code position + 1} times, returning the element at the {@code
   * position}th position.
   *
   * @param position position of the element to return
   * @return the element at the specified position in {@code iterator}

    assertThat(stats.loadExceptionCount()).isEqualTo(0);
    assertThat(stats.hitCount()).isEqualTo(2);

    key = new Object();
    assertThat(cache.get(key, Callables.returning(value))).isSameInstanceAs(value);
    stats = cache.stats();
    assertThat(stats.missCount()).isEqualTo(3);
    assertThat(stats.loadSuccessCount()).isEqualTo(4);
    assertThat(stats.loadExceptionCount()).isEqualTo(0);

    assertThat(stats.loadExceptionCount()).isEqualTo(0);
    assertThat(stats.hitCount()).isEqualTo(2);

    key = new Object();
    assertThat(cache.get(key, Callables.returning(value))).isSameInstanceAs(value);
    stats = cache.stats();
    assertThat(stats.missCount()).isEqualTo(3);
    assertThat(stats.loadSuccessCount()).isEqualTo(4);
    assertThat(stats.loadExceptionCount()).isEqualTo(0);

   *
   * <p>When the weight of an entry is zero it will not be considered for size-based eviction
   * (though it still may be evicted by other means).
   *
   * <p><b>Important note:</b> Instead of returning this as a {@code CacheBuilder}
   * instance, this method returns {@code CacheBuilder<K1, V1>}. From this point on, either the
   * original reference or the returned reference may be used to complete configuration and build

      apply {
        this.retryOnConnectionFailure = retryOnConnectionFailure
      }

    /**
     * Configure this client to perform fast fallbacks by attempting multiple connections
     * concurrently, returning once any connection connects successfully.
     *
     * This implements Happy Eyeballs ([RFC 6555][rfc_6555]), balancing connect latency vs.
     * wasted resources.
     *

         * an array and when a value is potentionally overriden it is added to the array. The single
         * arg option value is retrieved and instead of returning values[values.length-1] it returns
         * values[0] which means that the original value instead of the overridden one is returned
         * (first wins). With properties values are truely overriden since at the end a map is used

     * requested that all dependencies are placed on the class path, with no module path element.
     *
     * @param scopeFilter a filter returning {@code true} for the artifact scopes to accept
     * @param includeTestDir whether to include the test directory in the classpath elements
     * @return paths of all artifacts placed on the classpath