@Override
  protected boolean preprocessUsages(@NotNull Ref<UsageInfo[]> refUsages) {
    final MultiMap<PsiElement, String> conflicts = new MultiMap<>();
    final UsageInfo[] usages = refUsages.get();
    for (UsageInfo usage : usages) {
      collectConflicts(usage.getReference(), conflicts);
    }

    return showConflicts(conflicts, usages);
  }
@Override
  protected boolean preprocessUsages(@NotNull Ref<UsageInfo[]> refUsages)