public static LookupElement addElementLookupItem(Set<? super LookupElement> items, PsiElement element) {
    final LookupElement item = LookupItemUtil.objectToLookupItem(element);
    items.add(item);
    item.putUserData(TemplateLookupSelectionHandler.KEY_IN_LOOKUP_ITEM, new JavaTemplateLookupSelectionHandler());
    return item;
  }
public static LookupElement addElementLookupItem(Set<? super LookupElement> items, PsiElement element)