+ "isCancelled() == true: "
                    + future,
                exception));
      }
      return new Failure(exception.getCause());
    } catch (CancellationException cancellation) {
      if (!wasCancelled) {
        return new Failure(
            new IllegalArgumentException(

          return;
        }
      }
      final V value;
      try {
        value = getDone(future);
      } catch (ExecutionException e) {
        callback.onFailure(e.getCause());
        return;
      } catch (Throwable e) {
        // Any Exception is either a RuntimeException or sneaky checked exception.
        callback.onFailure(e);
        return;
      }

                  started.countDown();
                  try {
                    return method.invoke(delegate, args);
                  } catch (InvocationTargetException e) {
                    throw e.getCause();
                  } finally {
                    awaitUninterruptibly(canReturn);
                    returned.countDown();
                  }
                }
              });

                  started.countDown();
                  try {
                    return method.invoke(delegate, args);
                  } catch (InvocationTargetException e) {
                    throw e.getCause();
                  } finally {
                    awaitUninterruptibly(canReturn);
                    returned.countDown();
                  }
                }
              });