@Contract(pure=true)
  public @NotNull LookupElementBuilder withRenderer(@Nullable LookupElementRenderer<LookupElement> renderer) {
    return cloneWithUserData(myLookupString, myObject, myInsertHandler, renderer, myExpensiveRenderer, myHardcodedPresentation,
                             myPsiElement, myAllLookupStrings, myCaseSensitive);
  }
@Contract(pure=true)
  public @NotNull LookupElementBuilder withRenderer(@Nullable LookupElementRenderer<LookupElement> renderer)