private void addSiblingFeatures(@NotNull PsiElement element, @Nullable String tokenFeature) {
    if (!Registry.is("similarity.find.usages.use.sibling.features")) {
      return;
    }
    myFeatures.add(tokenFeature + " PREV: " + getPrevMeaningfulSibling(element));
    myFeatures.add(tokenFeature + " NEXT: " + getNextMeaningfulSibling(element));
  }
private void addSiblingFeatures(@NotNull PsiElement element, @Nullable String tokenFeature)