void (@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)); }