Null
  private static List<String> collectLabelElementNames(@NotNull List<? extends PsiCaseLabelElement> elements,
                                                       @NotNull Set<? extends PsiClass> missingClasses) {
    List<String> result = new ArrayList<>(ContainerUtil.map(elements, PsiElement::getText));
    for (PsiClass aClass : missingClasses) {
      result.add(aClass.getQualifiedName());
    }
    return StreamEx.of(result).distinct().toList();
  }

  
Null
  private static List<String> collectLabelElementNames(@NotNull List<? extends PsiCaseLabelElement> elements,
                                                       @NotNull Set<? extends PsiClass> missingClasses) {
 