private void addConstantsFromReferencedClassesInSwitch(final Consumer<? super LookupElement> results) {
    if (!JavaCompletionContributor.IN_SWITCH_LABEL.accepts(myPlace)) return;
    PsiSwitchBlock block = Objects.requireNonNull(PsiTreeUtil.getParentOfType(myPlace, PsiSwitchBlock.class));
    final Set<PsiField> fields = ReferenceExpressionCompletionContributor.findConstantsUsedInSwitch(block);
    final Set<PsiClass> classes = new HashSet<>();
    for (PsiField field : fields) {
      ContainerUtil.addIfNotNull(classes, field.getContainingClass());
    }
    for (PsiClass aClass : classes) {
      processMembers(element -> {
        //noinspection SuspiciousMethodCalls
        if (!fields.contains(element.getObject())) {
          results.consume(TailTypeDecorator.withTail(element, JavaTailTypes.forSwitchLabel(block)));
        }
      }, aClass, true, false);
    }
  }
private void addConstantsFromReferencedClassesInSwitch(final Consumer<? super LookupElement> results)