@Override
  public void registerReferenceProviders(@NotNull PsiReferenceRegistrar psiReferenceRegistrar) {
    psiReferenceRegistrar.registerReferenceProvider(psiElement().inFile(psiFile(IgnoreFile.class)),
                                                    new IgnoreReferenceProvider());
  }
@Override
  public void registerReferenceProviders(@NotNull PsiReferenceRegistrar psiReferenceRegistrar)