@Override
  protected MultiMap<PsiElement, String> getConflictDescriptions(UsageInfo[] usages) {
    MultiMap<PsiElement, String> descriptions = super.getConflictDescriptions(usages);
    for (UsageInfo usage : usages) {
      PsiElement element = usage.getElement();
      if (element instanceof PsiMethodReferenceExpression && needLambdaConversion((PsiMethodReferenceExpression)element)) {
        descriptions.putValue(element, JavaBundle.message("refactoring.method.reference.to.lambda.conflict"));
      }
    }
    return descriptions;
  }
@Override
  protected MultiMap<PsiElement, String> getConflictDescriptions(UsageInfo[] usages)