code: @ReplacedBy("com.google.common.util.concurrent.Callables#returning()")
      public static <V> Callable<V> asCallable (final V value)
      {
          return new Callable<V>() {
              public V call () {
                  return value;
              }
          };
      }
docs: Return a {@link Callable} that merely returns the specified value.
  No exception will ever be thrown.