rootLocaleFormat(
                  "%s.%s() must return an array of %s.",
                  annotationClass, propertyName, annotationClass.getDeclaringClass()))
          .that(returnType.getComponentType())
          .isEqualTo(annotationClass.getDeclaringClass());
    }
  }

  // This is public so that tests for Feature enums we haven't yet imagined
  // can reuse it.

     */
    public V[] toArray(final V[] proto) {
        @SuppressWarnings("unchecked")
        final V[] array = proto.length >= size ? proto : (V[]) Array.newInstance(proto.getClass().getComponentType(), size);
        for (int i = 0; i < array.length; i++) {
            array[i] = getAt(i);
        }
        if (array.length > size) {
            array[size] = null;
        }
        return array;