@Override
  public void findConflicts(UsageInfo[] usageInfos, MultiMap<PsiElement, String> conflicts) {
    for (UsageInfo info : usageInfos) {
      final PsiElement element = info.getElement();
      if (element instanceof PsiMethodReferenceExpression) {
        conflicts.putValue(element, JavaRefactoringBundle.message("expand.method.reference.warning"));
      }
    }
  }
@Override
  public void findConflicts(UsageInfo[] usageInfos, MultiMap<PsiElement, String> conflicts)