@Override
  public void indexStub(@NotNull GrReferenceListStub stub, @NotNull IndexSink sink) {
    for (String name : stub.getBaseClasses()) {
      if (name != null) {
        sink.occurrence(GrDirectInheritorsIndex.KEY, PsiNameHelper.getShortClassName(name));
      }
    }
  }
@Override
  public void indexStub(@NotNull GrReferenceListStub stub, @NotNull IndexSink sink)