protected static void checkConflicts(Ref<UsageInfo[]> refUsages, MultiMap<PsiElement, @DialogMessage String> conflicts) {
    for (UsageInfo info : refUsages.get()) {
      final String conflict = ((FixableUsageInfo)info).getConflictMessage();
      if (conflict != null) {
        conflicts.putValue(info.getElement(), conflict);
      }
    }
  }
protected static void checkConflicts(Ref<UsageInfo[]> refUsages, MultiMap<PsiElement, @DialogMessage String> conflicts)