@Override
  public boolean isOK(GrIntroduceDialog dialog) {
    final GrIntroduceSettings settings = dialog.getSettings();
    if (settings == null) return false;
    String varName = settings.getName();
    boolean allOccurrences = settings.replaceAllOccurrences();
    final MultiMap<PsiElement, String> conflicts = isOKImpl(varName, allOccurrences);
    return conflicts.size() <= 0 || reportConflicts(conflicts, getProject());
  }
@Override
  public boolean isOK(GrIntroduceDialog dialog)