void addKeywords(Set<LookupElement> set, CompletionVariant variant, Object comp, TailType tailType) {
    if (!(comp instanceof String)) return;

    for (final LookupElement item : set) {
      if (item.getObject().toString().equals(comp)) {
        return;
      }
    }
    addLookupItem(set, tailType, comp, variant);
  }
void addKeywords(Set<LookupElement> set, CompletionVariant variant, Object comp, TailType tailType)