/**
 * This is needed for 'initialize(injector)' below to be called so the provider
 * can get the injector after it is instantiated.
 */
@Override
public <B, V> V acceptExtensionVisitor(
        BindingTargetVisitor<B, V> visitor,
        ProviderInstanceBinding<? extends B> binding) {
    return visitor.visit(binding);
}