abstract Iterable<? extends K> getInterfaces(K type);

    abstract @Nullable K getSuperclass(K type);

    private static class ForwardingTypeCollector<K> extends TypeCollector<K> {

      private final TypeCollector<K> delegate;

      ForwardingTypeCollector(TypeCollector<K> delegate) {
        this.delegate = delegate;
      }

      @Override
      Class<?> getRawType(K type) {