code: @CanIgnoreReturnValue
    @VisibleForTesting
    static <V, X extends Exception> V getChecked(
        GetCheckedTypeValidator validator, Future<V> future, Class<X> exceptionClass) throws X {
      validator.validateClass(exceptionClass);
      try {
        return future.get();
      } catch (InterruptedException e) {
        currentThread().interrupt();
        throw newWithCause(exceptionClass, e);
      } catch (ExecutionException e) {
        wrapAndThrowExceptionOrError(e.getCause(), exceptionClass);
        throw new AssertionError();
      }
    }
docs: Implementation of {@link Futures#getChecked(Future, Class)}.