LookupElementBuilder (@NotNull String another) { final Set<String> set = new HashSet<>(myAllLookupStrings); set.add(another); return cloneWithUserData(myLookupString, myObject, myInsertHandler, myRenderer, myExpensiveRenderer, myHardcodedPresentation, myPsiElement, Collections.unmodifiableSet(set), myCaseSensitive); }